AST cards were not perfect.

Their goal this expac was to better balance the three healer kits. The problem here is that AST had a pretty decent mitigation tool within it's RNG card buff system.
They couldn't balance for the possibility of having the Bole available.

Additionally, large scale Crit and Speed buffs are hard to balance, not least because of how Crit scales making it progressively more powerful the further into the current expansion we are. This is why BRD lost it's crit procs, and partly why Wildfire was changed so as not to double up on crits.

Overall the buffs were scaled back to reduce the amount of burst rdps AST kicks out, and make it a bit more consistent.

NINs Trick Attack got a similar treatment.