IFFF there were more useable feats then the value of those last 2 levels of fighter would have easily increased over a 2 rogue splash (especially since fighters struggle to get the reflex necessary for evasion).
The ONLY class where there was a legitimate reason to give something nice was rogue. Mainly because WOTC messed up its design and you get all of your class abilities by level 19.
And I'm not even going to get into the relative power of the capstones. When a capstone is stronger than any feat in the game, then you have a problem.