I disagree with the Defense boosting feats.
If you're going to use the char-op board "opinion" of what is a feat tax (and I'm saying you not necessarily should), the defense boosting feats are nowhere near a feat tax status.
Most builds (at least 80-90% of them IME) never bother with those feats so I'm not sure why they would be considered equivalent to Expertise.
Because it appears a number of people only look at offense. I'll use my Genasi Swordmage as an example. Improved Swordmage Warding has been the difference numerous times in getting hit or not, which is very important especially on those occasions I'm the only melee character. Versatile Resistance in late heroic saved me approximately 90 HP of damage in a finale encounter, without it I'm down and the party most likely is a TPK as the squishy spellchuckers would then be exposed.
And I still hit as often as any character in the group. When I want to unload a daily, or even a regular power, I look for combat advantage and bonuses where I can, sure. I also use a +3 proficiency weapon. If you choose a +2, you may feel a bigger need to compensate for that missing +1, but it was one's choice to take the +2 weapon and there are always trade offs.
Part of me wonders if those screaming "feat tax" are really just poor tactical players who can't or won't look for the myriad of bonuses in the game play. There's a difference between being a min/maxer and a tactical player. For example, some groups eschew controllers because "they don't do enough damage" but controllers status effects can gain a group a lot of bonuses.