Okay, let me ask it a different way: Suppose a fighter took only Skill Focus for every feat. Would such a fighter be crippled in a high level game as far as combat goes?
Or how about Toughness, since at least that provides some combat benefit to the fighter. Taking toughness 19 times would give a 20th level fighter an extra 57 hit points.
My real question is: are feats really that powerful, and how much do they affect game balance? The most bonus you can get from a feat is +2, because you can't stack them, so a fighter with no feats would only be two levels behind a fighter with feats, as far as numbers go. Also feats are mostly applicable only in a specific circumstance, so while the feated-fighter has an edge in that particular circumstance, the rest of the time he has no edge over the non-feated-fighter.
Exceptions are Power Attack and Expertise, which can produce huge bonuses and are useful in nearly any combat situation; Toughness, which is useful in ALL combat and stacks to high levels; Rapid Shot which can double your attacks with a missile weapon.
The only difference between a Warrior-20 and a Fighter-20 is eleven feats and 21 hit points... and those are considered to be worth 1 CR all together.
Is a 20th level Warrior really an even match for a 19th level fighter?
Mike