You're basically suggesting that they do as much HPS as a WHM (even more with the Synestry buff which is currently the most powerful heal buff in the game) and still retain their card buffs on top of that? You might as well just type out "I want to make WHM obsolete as much as possible."

The reason they have weaker abilities is BECAUSE they have utility. WHM has 0 party utility other than the cross-classed Virus (which is useless in raiding since everything is magic) and Eye for an Eye which has a much longer cooldown than the traited version ACN has. All WHM can do is heal. That's it. If they don't do it the best, then there's no point in even having it as a playable job.

I agree that Nocturnal stance leaves a lot to be desired for AST since SCH is pretty OP right now (probably the strongest healer of the 3 when averaging offensive ability, defensive ability, MP managment, MP cost, heal ability, and utility all together). Diurnal is fine the way it is.