AST, healing wise, is completely fine. I have zero complaints about how AST heals, it's thematic and unique, the problem is just WHAT they have to heal (basically nothing). But that's a fight and overall healer design issue, and addressing things on AST only won't fix that problem.

But literally, the biggest complaint of AST players, both people who play them, and people who don't, is the busy burst window. Some people like it a lot, myself included, but I'll admit that it's hard for most people to get into. And while I'd love to just say 'skill issue' and 'if you don't like it, go play another healer' SE has this mindset where a job literally cannot be allowed to be difficult, so a solution has to be provided. So what I anticipate we'll get from Dawntrail is some kind of change to cards to make them just... piss easy to use. If I had to guess, AoE cards are the easiest change, and possibly the one I'd hate the most bc it turns quick thinking, reactivity, and a reward for knowing how other classes work into 'draw, play, draw, play, etc' which like... I'd probably quit the class off that. The best change is to shift around where your weaves actually are, and get rid of extraneous button tax like astrodyne, and minor arcana so that your burst isn't as blisteringly fast. I think, as much as I complain, as long as cards are still single target, still require decent weaving, and still reward you for understanding how other classes work, I'll still main it. Because what other job even gives that experience? Dancer and dragoon are the only other classes with single target buffs, and dragoon only uses theirs once every 2 minutes on the same person every time, and dancer has full, permanent uptime on their damage buff.