My 158 DRK feels like she's a better tank than my 196 PLD. DRK has an enormous AoE toolkit, mitigation that's just about as good as PLD (in some cases better), and a more compelling gameplay style.
And to agree with OP, these changes won't help that. Sure, I'll do more DPS against the mob I have targeted. But I'm not worried about that mob; I'm worried about the seven others that the BLM keeps pulling off of me. And Flash only does so much.
EDIT: I should not have to save my only offensive CD for AoE enmity or risk losing all of it. CoS doesn't do the trick without it.