We obviously need to play it before passing a definitive judgement, but from what they showed and said, the changes look really disappointing and kind of upsetting as someone who has been playing the job since Stormblood.
That was my favourite instance of the job, with varied buffs and creative ways to apply them. After seeing the footage, I only feel like they've gutted the job I love so much.
There's four healers in the game and AST was the only one who has some challenge to its job mechanics, what's wrong with having ONE difficult healer?
Even if the randomness has to go (which is a thing I like even if it frustrates me sometimes), I believe it can still be fast paced and complex without it, I hope the dev team reconsiders the changes.