[The Illustrious Number 6]

Erm, why would I be a troll? That remark was unwarranted.

As to whether or not WotC expects all math-savvy gamers to take these feats: I'm pretty sure they do. In one of their podcasts Mike Mearls and Dave Noonan discuss why there are so few ways to boost your attack bonus in the PHB. (It boils down to the fact that it's quite easy to boost your damage (or status effects), which means that every point of to-hit has a significant effect on combat effectiveness.) They also state that they've probably gone overboard in keeping the bonuses down. I find it unlikely that Mearls forgot all about that when he wrote PHB2.

Now, I agree that a change like this is better effected through the main rules rather than semi-mandatory feats, as I already stated before. However, it's not like it's the first time in the history of RPGs that a fix was pushed as an optional ability in a supplement rather than as a structural fix in the errata. Especially not if the game is still quite playable without the fix.