Fighter and barbarian are already extremely popular choices that are considered top tier classes. They are great at two really important aspects of the game: delivering and absorbing damage. I don't think they need a buff. So if we are talking about giving them more stuff, such as extra feats, then I think you would need to balance that out by reducing their damage and/or tankiness. I think lumping them in with rogues, and especially monks, is a mistake.
Look at how little attention this thread has paid to monks, a class that is legitimately weak.
The thing with a bunch of extra feats is that it will primarily benefit fighters and barbarians, two classes who need it the least.