What games had the best in universe explanation for why the character got nerfed in the sequel

I am thinking of Final Fantasy 7 Remake and Rebirth. You spend Remake getting your character to level 99 or whatever and then you pick up Rebirth and they start at level 15 for now real explanation other than "this is a new game".

What games actually have in-universe explanations for why the character got nerfed in the sequel?

I will start with most of the Kingdom Hearts games. Sora either loses his memory, has his powers taken away from him, or loses them due to some form of trauma.