Recitation Lustrate... what?

I mean SCH has big issues but your post is like a collection of points that prove you don't understand how healing works. WhM doesn't use Assize as a heal (unless it lines up with the cd) and ET + Succor is not a main heal source. You're comparing to WHM when AST is the heal king and SCH played well can produce incredible healing. Reci + Indom + Fey Blessing beats your Assize/Rapture example. Whispering Dawn outheals Plenary + Rapture if it gets full duration. Seraph is 420 potency prepped before and used after a raidwide and 640 if the shield from the second use is popped. All of these can be done on the move with Ruin II and without GCD.

Not trying to be rude, just pointing out that if you're having healing issues with SCH is probably a player issue and it can get better.