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Tsukiko only received a buff once, and only during breaks between parts of a single experience, because the system didn't change there, and other skills could be chosen. I don't remember any other such cases.
But here, the logic seems to be to adapt old characters to new realities so that they don't simply steamroll through all stages of the new game.
And, I must say, this is an argument against transfers. Indeed, it's an inconvenience for the GM to balance things so that transferred characters aren't completely on the level of greenhorn newbies, but also don't break the game. For players, there's a risk of "ruining" their favorite characters, and it's quite significant, as they might be nerfed. The only plus is if you lack the imagination for something new and interesting (this is relevant to me lately; it's hard to create a character that you can really get into).