Did you math out how much exp FOOM provides, versus how much it costs to start up? Because I did. It takes far, far longer than your randomly named "three months" to pay back the investment lol. And again, exp has diminishing returns in terms of value per point. And skill pyramid has rules to it. It, in fact, takes multiple years to even get even, for Ami.
The formula below is a 99% accurate formula for exp required for one full column with an X capstone, using normal cost skills:
Exp = 0.038x^(2.855)+91
To reasonably refer to it as "FOOM", Ami would need Resolve 70 or so at least. She needs propping skills for that, one of which can be Shadow Clone 60, because she wants that anyway for FOOM. This additional column will cost her 7130 exp. Even if her xp rate is 4.75/day (we know even Itachi isn't 5/day), this is 1501 days, or over 4 years of spending exp on just that.
The resulting safe (Pass clone sickness check on -9 dice) FOOM efficiency, at the end, is optimistically ~76 clone hours. Each clone training block is 3 hours. This means 25 training blocks a day, or +250% xp, as each training block is +10% xp. The starting safe FOOM efficiency (which she can only start doing at SC 30+, so it doesn't immediately start), is, assuming Resolve 40 at present, ~46 clone hours. This means 15 training blocks, or +150% xp. Extrapolate between the two, and the average extra exp rate she gets via FOOM is +200%.
Sounds like a lot, yes? Well, its not really, because that still takes over two years to pay for itself only. And then you have to consider that it forces a Resolve capstone-ish, as well as the same for SC, meaning your actual prowess is lower than your pyramid skills would indicate. So payoff is more like three years really, at the very least. And then you're stuck with a hefty multi-column because you're a social spec too, and you continue to pay the price going forward as a result.
As a rule of thumb it takes triple the exp to go up by 20 levels. So long-term (we are talking half a decade or more in the future), Ami would be at the absolute most 20 levels ahead of where she would be without FOOM, with 10 of those levels being in Resolve, so its really only 10 levels ahead. She would still be paying the opportunity cost years from now! FOOM is not a magic trick that makes you a god. Its good for chuunin going to jounin, and jounin with narrow column builds who want to get ahead, but its not some crazy shiny.
Ami is in fact probably better off not FOOMing but just getting SC to 30 and training with it without going full on FOOM, its nearly the same gains for her, with basically no startup cost. And she is getting SC anyway, as she is a Leaf jounin now, and I can't imagine she'd not want that technique or be unaware of it being a thing. She might even already have it.
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