I would be very disappointed if we went into the fight with Galaxia and had no question that we will win with no significant struggle.
From a Watsonian perspective, fine, that's the ideal because no one wants a few quintillion lives snuffed out and the universe rent asunder, so losing "isn't an option"
But from a Doylist perspective a fight we have no hope of losing is just as boring as a fight we have no hope of winning. It ends up being the same as doing a scene about Usagi digging for spare change in the couch. The best we can hope for is a bit of humor, but at the end of the day the results are pre-determined and don't really involve anything interesting happening.
I think the issue is that the Watsonian perspective alone is going to lead to a story with no stakes. A story with no stakes is boring, and I don't want this story to be boring. Yes, we have prevented tragedies, but I also want to again point to the Pretty Cure Dog fight... I'm not really certain of a good way to measure it, but that fight really didn't hold my interest. It was so abundantly clear that we outclassed everyone that is was really only a concern of "is sailor moon accidentally going to kill someone's puppy". Which... that's not a thing I want to see. Same thing with the Weaponshop fight. We sent Jupiter and Mars because we were concerned about the concentrated power of that force... and it was completely a non-issue. Inuyasha took the entire place practically solo.
Even the chicken house you were so concerned about... was nothing. Lost immediately after the concerns were voiced, because it stood no real chance against us.
Responding to a fight where we had a total and complete victory with no injuries with a call to train more because we aren't yet invincible... I don't find that useful.
There are many kinds of ways stories can be interesting, sometimes "will they win" is the draw (or more accurately, how will they win, most stories have victory baked in from the start, even if sometimes the trip to it is not direct), other times the draw is "what will they do now".
Just because we can't be physically beaten does not mean there are no stakes, we are still less than a dozen Shenshi, in a world of 7 billion people.
Challenges do not need to be martial in nature.
I have at no point felt we could not take out the chicken house (unless we rolled several crit fails i guess), the amount of forces we sent to this slave store could have taken almost anything short of a major god, and possibly even that.
My point was that given that there now are prowess 65 enemies that can just, appear, when even Kunzite was far below that even when dangerously overdosing on life energy, our current prowess can't be counted on to ensure victory when we can't predict what level of opposition there is.
So i would like to keep on training like we have until now.
Why would we have to make a decision on what to do? He's committing the same level of crimes as a horny teenage boy, he's a nuisance sure, but nothing about anything I know of him makes him any more dangerous than a purse snatcher.
And if the response is "his crimes are serious enough that we should act" then we should have BEEN acting against people who commit the exact same crimes who we can stop. But they aren't. The only difference is Happosai is strong enough no one has stopped him before, and now that we are, people want to see him get his comeuppance.
Horny teenage boys can be generally dealt with by society, and are not able to fight gods and have a change to win.
Also if a horny teenage boy is constantly committing sexual assault and/or harrasment, maybe something should be done? Probably by their parents?
Also, Happosai is not a horny teenage boy, who, usually, get a degree of "they are young and stupid" leeway, the man is over a hundred, the assumption (reasonable or otherwise), that he is going to learn better over time is kinda past its sell by date.
We always need to decide what to do, sometimes that decision is "nothing".
If the senshi meet someone who keeps committing sexual harrasment and/or assault, they definitely should make somekind of decision about what to do.
That might be calling the cops, or yelling pervert, or possible calmly escorting them away from who ever they were harrassing.
If it ever comes up in the story, we'll see.