You do know AST heals for more than WHM across their entire healing toolkit right?
And that WHMs healing is RNG now so it can't even be relied upon 100% of the time.
They also have nearly 0 mitigation and NO AOE mitigation.

On top of all of that, content REQUIRING a WHM would be unbalanced.

Btw, can we stop saying that? The whole "WHM level heals" thing. Because WHM isn't the strongest in even healing anymore they simply have MORE healing spells. Their potencies are actually weaker now. They don't even have the strongest AOE heal in the game anymore.