WHM Vs AST Healing Comparison at 50

[Staris]

Sure they're efficient, but do you really want to see your raid at 80% health and wait 20 seconds for it to slowly fill up? Will you even have that 20 seconds before the boss unleashes another AOE?

This is a argument that misses any real application.
If the WHM topped off the raid from nearly no life in 1 medica 2 and 2 medica 1s, the Astro would do it in the same amount of casts and cost them less mana and less overhealing, the potency's are nearly identical in application.