WHM Vs AST Healing Comparison at 50

[VitalSuit]

We can save a tank with a 25% damage reduction for 15 seconds (or a 10% for 30). We can give the whole group 15% more damage for 15 seconds

Our 40 sec cooldown "OH SH*T" button is probably the best I've ever seen in a healing class in an MMO: "You just dropped to 10% HP? Here, have a completely full instant refill!"

AoE damage buff will be 5% not 15%. Benediction can do the same thing as an "oh crap" heal but on a much longer cooldown so I agree with you on that, a 40sec CD Lustrate isn't all that bad but Lustrate is still better.

I confess I lack proper knowledge of the card system but people here are proposing a team wide AOE buff?

Yes, if you Royal Road either the Spear or Arrow cards you will get the ability to AoE your next card used but at 50% less potency. So if I were to Royal Road Spear and then draw Balance (10% increased damage) I can give it out to the entire party but at 5% damage.