What exactly IS a White Mage?

[Daniolaut]

Even if it's very powerful in terms of healing, AST can actually MATCH their healing now with their current Recasts. While its MP Pool is pretty large, I don't think raising more is a good thing to note.

If you’re strictly talking “meta healer”

Which sounds like you are trying to,

then no any “meta” group isn’t going to take “powerful jobs” because those don’t boost party dps. They will always take whatever will boost their FFlogs numbers.

Design wise WHM should do more dps than an AST, but if that’s not the case then yes SE should fix that ASAP.

Otherwise again it’s the progression style “powerful” job of the healers.