I'm surprised they want to touch Ast of all healers.
I can't judge how it plays on controller because I only know the M/K controls, I only heard that it's a living nightmare during opener and reopener with SD. On M/K I honestly think it's fine. Yes, lots of target switching while making decisions, but it's a matter of practice and Ast being a more busy healer is imo fine.
That they apparently want to buff MP economy seems a bit weird to me because it is the only thing keeping Ast somewhat in check while already being the strongest healer. Being the only healer that tends to meld Piety seems like a fair trade off for the high amount of free healing, mobility and high rDPS they bring.

Fairy skills ghosting from Dissipation/ Summon Seraph on Sch and clipping on WhM are more important issues.
Being forced to spread any fairy skill and Dissipation or Seraph to two different instants to avoid ghosting and sometimes still watching a skill not go off in time is really frustrating. And I liked the suggestion from YusiKha to make Assize a 1,5s GCD. It would alleviate a lot of forced clipping on WhM.
And then there's still the fact that Sch capstone skills are mutually exclusive and WhM tries to ignore its unique job mechanic as much as possible.

Sch and WhM definitely deserve much more attention than Ast.
I'm all for a tiny tweak to SD so you can't get screwed by it (cheers for 1 seal opener Divination...) but that's about it for me.