Why are only ninja who know about macerators capable of asking what happens if you store a moving object?
What IV said. But also:
I do still think that it's entirely likely that no one would have tried this, as while macerator-like effects are something that lots of people have come up with (or, at least, some folks in Rock have done similar), the idea of storing the resultant object while in motion would not come naturally. I mean, look at us: so many people playing this quest for years and it took me this long to come up with the idea even with the modern perspective on motion and heat both being energy. In addition, of course, to the idea that experimenting with seals in the way Hazou does so casually is anathema to most sealmasters, even research ones. And this insight would require a research sealmaster's efforts to do anything with, because the way I was envisioning it...
Well. First off, I don't think it would be very easy to store an object in motion to begin with, with a basic storage seal. We can do it, but like... the timing would be really really hard... and impossible to do with a basic elemental clone, and potentially dangerous to do oneself, depending on the methodology. Secondly: Doing this at combat-effective level requires throwing your object at high speed, capturing it successfully (so at least two people to cooperate) and being certain of how it will emerge. The latter part can be done with a clone, so I won't penalize it too much for that. Third: It may be actually impossible in practice to "catch" objects in motion with a basic storage seal, even if possible in theory, because of needing to touch the seal or something about that.
The unique insight my seal design brings is more or less a *duration* of storage for a single object so that it can capture the item in question as it passes rather than needing to happen precisely the moment it touches the seal. (There may be other effects to it, but that's the basic idea.)
So, having said all that: let's do a probabilistic analysis of this.
Call that a 20% chance that someone would try this, if they had the idea. The kind of creativity and willingness to engage in it that Hazou operates with is notably rare according to many in-setting.
I'll say... 50% chance that someone has some combination of things that allows them to safely do testing. 40% from base odds that someone has Earth or Water affinity, extra 10% to cover people learning new affinities, clan shenanigans allowing it, etc.
Let's call it a 30% chance that someone has a friend willing to help them with sealing experiments. Again, most people aren't Hazou.
Let's call it a 15% chance that the research sealmaster survives long enough for this to spread or leak -- this one's really low because of how many things have been lost to the ages IRL, and the sheer amount of death in-setting.
What's the odds that someone comes up with this idea to begin with? Well... that's hard to put numbers to. This is going to be long and rambly and probably I'll come up with numbers that aren't important, but let's try to work it out anyway. There have been 626 people that posted in this thread, total. That's not really a fair number, though: Let's call it 75 for everyone that has made more than 500 posts in the thread. Given the way we interface with the story I think it's fair to consider us "research sealmasters" for the purposes of this analysis. The thread has been running for about 8.3 years. Okay. We're getting closer to good numbers here. 75 research sealmasters putting in, I'll say, an average of thirty minutes of thread-investment per day (obviously people like me and faflec and everyone who is reading this right this instant are outliers, but I'm trying to be generous to the "this is easy to come up with" side.)
That's about 45,442.5 man hours of eyes on the topic from sealing researchers (We have no idea where this falls on the bell curve of likelihood to discover. I assume median, but it could be on either end.). How much time does the average sealmaster spend doing research? Well, I don't know that this is something I can reasonably guess, so I'm just gonna say: Given the culture of ninja and the predilection for people to throw themselves pointlessly into combat in spite of not having a combat specialty,
Ebisu*, let's call it an average of 30 hours a month. This sounds like very little. It is. However: This is averaged across their lives, including time on missions, with family, etc. So. How many sealmaster years does it take to equal the investment of the hivemind here? 126 years.
How long does the average research sealmaster live? Well. it is known to be a
fraught job, even by the standards of ninja. The average ninja is a genin, and the average ninja lives 3 years, according to Inferno Vulpix, who is Known to be the guru of such statistics. He also shares that Chuunin live an average of 1.55 years and Jounin an average of 2 years. At least in Mist, sealmastery is more of a chuunin specialty. I'm gonna assume that remains the case elsewhere. Given that sealmasters still take combat missions because they're fucking idiots like Ebisu (see also: Kurosawa), let's be generous and say it lowers their average lifespan by 30%, to 1.085 years.
So, wrapping back around, that is 116 average-sealmaster-lives that our investment equates to. This does not seem like too far off of a number, even if this math is fucky and me throwing numbers at a wall, so it's close enough to play ball with.
How much research time is put toward storage seals? To answer this, we'll need to know the total-effective-research-GDP, for which we'll need to know the average number of sealmasters in a village. Well, we've been told that in Leaf, where Jiraiya makes his home, they aren't especially common (this is not true now, of course, but historically is what we're concerned with right now): at most one per clan, and frequently significantly less. Let's call that four or five on average per major village, and 1-3 for a minor one. Assuming that storage seals were available at the start of the village era, 70 years ago, that means somewhere around 25-30 ish active research sealmasters across the whole Elemental Nations. Call it an even 30. They've been working, as previously established, at 30 hours a month on average for their lives, and in the 70 years since the Village Era's start, they have managed a total-effective-research-GDP effective 756,000 research hours spread across all fields. (30 hours a month * 30 sealmasters * 70 years)
But how much time toward storage seals? We know from Jiraiya that Rock has worked on time-delayed storage seals about forty years back, but not much more than that. Let's call it... on a guess, 8% of total-research-GDP toward storage seals and storage seal accessories. That's 60,480 man-hours toward munchkinning storage seals.
Now we're getting somewhere! That sounds like a lot. However! It does not take into account the likelihood of coming up with this particular adjustment of storage seals, it is just raw brains thrown at storage seals. The important part, is that having done some research, talked to a couple friends of mine involved in research fields IRL, and asked on the MfD discord, is that the odds of having a particular insight are somewhere between 5 and 10%. (This is probably wildly higher than it actually would be; there's lots discovered every year IRL that we could have discovered in the sixties.)
So let's multiply it all out, taking into account all of this. 60,480 * .2 * .5 * .3 * .15 * .1 = 27.216 probabilistic research hours on this problem in particular across the whole of the EN.
I leave it as an exercise to the reader whether 27 research hours split across a dozen nations is sufficient to come up with this.
*I'm shitting on Ebisu relentlessly here. This isn't a dig at y'all's writing or anything. I'm just annoyed at him and he makes a good example.
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...Anyway. All of that is to say, based on that fermi estimate I don't think it's unsimulationist that no one have thought of this.
e: Some things I forgot to mention: I don't think that research prior to the village era is especially likely to be relevant on the scale of things, because of the massively-increased odds of research being lost with a single sealmaster's death.