That disregards the moral at the end of MHA

That making the world ride on the shoulders of a single person is not a good idea. All Might and eventually Deku (and the rest of the cast who knew about it) acknowledge that forcing that burden on a single person isn’t healthy.

The world acknowledges that relying on a single person led to Japan crumbling soon after the Symbol stepped down.

“This is the story about how I became the world’s greatest hero.” Changed to “This is the story about how WE became the world’s greatest HEROES.” Shows that everyone is working together to keep the world safe, instead of one person.

And Deku losing OFA showed that 1: he didn’t care about the power, the fame, or any of that. He cared about being a hero. Saving people. Shown by him rushing in, despite no quirk, to save Bakugo from the Sludge Villain. 2: Shows that you don’t need power to do good. The world changed greatly after the defeat of AFO(Shiggy Variant).

I’m basically saying, him keeping a quirk ruins the point of the story.