First things first. WHM in raiding is all about dat B...cure III and sustained healing. Encroaching on medica II isn't that big of a deal.
It's giving AST even more dps that is troubling.

The card clipping being addressed is a good thing IMO, yes it does give AST a little more dps but the (assumed) gained fluidity is well worth it. The MP buff to lightspeed touches on the current balance however. For the sake of consistency lets say that it wasn't fair that only ast had to really worry about piety and move on.
The fact that lightspeed now no longer reduces dps however..... I get that it's a nice gameplay addition for dungeon content and gravity spam a la thin air holy spam.. but this is just such a significant change for raiding.

At this point it just looks like they took a WHM, removed it's Cure III and bene. Combined thin air with presence of mind = lightspeed, gave it way better raid dps and voila: AST.

Kinda rough.