Funny, people used to say the same about Golang.
Turns out, sometimes shedding "functionality" is really shedding cruft that holds the core functionality back.
Is this the case for Codeberg vs. Github? I don't know, and I'm not gonna base my argument on unverfieable predictions of the future.
So we'll have to wait and see. But it sure looks to me like many of the prime arguments for github boil down to "well, it's big and has lots of stuff".