AST's weakness in end game

[Nekotee]

Last i recall
If you compare AST and whm
They have the same single target potency and AST has a lower mana cost, is a lot faster thanks to diurnal, and have a double mana regen (LA and ewer) that can be both extended...

I'm sorry i fail to see how whm is better ?

Oh yeah cure III, assize and asylum in aoe healing...
Yup good... But lightspeed allow the same for more or less the same mana cost

The two best thing of the whm
""'Instant""" benediction that can save anyone and bypass CS (can you see the quote for the instant part... Friggin animation)
And the enmity reduction provider by the shroud...
Which made him the only healer able to remove his aggro (and this is huge !)
Ast can only nullify it and sch has nothing...
....

The SCH can be far more stronger than the AST with crit...
Basic AST shield are better, but SCH are double with crit

EoS allow the SCH to be stronger because of her bonus healing skills
Otherwise... What can beat the instant shield from AST ? Seriously?
(I stop counting how many lazy derp i saved with that, especially on Alex 4 NM)