Evidence suggests that is not the case. I have seen nothing to support the claim a majority of games use feats. Do you have a citation for that?While I like no feat games, I don't consider no feats to be the default game, no matter whether the rules describe them as optional or not, in practice they are used in most D&D games being played.
So you can have your "default" by rule
I'll take my "default" by practice