I don't see how three or four choices between ~ 50 feats can be more complex than 20 choices between five or six times that, frankly. (And that's not even speaking about the fact you can simply build your character only with ASIs, and that was the default in 5e14.)
I get that very invested people want very involved systems with lot of choices and customisation, but I, even as a really invested person myself, would rather play not only with other very invested people like me, but also with players well less concerned with that kind of minutia, who are many, and vastly more varied, and who like to put their creative minds elsewhere. Character mechanics are one aspect of TTRPGs, among many. I like TTRPGs that accept players interested in all kind of aspects, not just this one.