Only leveled AST to 83 so far (been focusing on leveling DoL & DoH after finishing the story) but i can't say i'm a fan of the job in its current iteration.
The new AST feels incredibly hostile to Controller players since the kit is unnecessarily bloated, The new seal system feels pointless and the buffs Astrodyne provides are hilarious. Giving AST a second albeit weaker Lucid dream is so overpowered you might as well remove MP from the UI altogether. The speed and DPS Buffs are also great on paper until you realize that you're buffing the healer with the weakest personal DPS so there is really not much point to fishing for 3 seals. At least the speed buff also affects HoTs (because we really needed that) but it still doesn't feel as good as PoM on WHM. I really liked the card system in SB and the ShB one i could get behind after they ironed out its kinks with patched but here its the seal gauge is so underwhelming it might as well not exist. The best i can say about it is that its not WHM SB Lilies level of bad. Because of the Card system feeling underwhelming every button taken up by it feels even more jarring than before. While i appreciate that Minor Arcana got reverted to a previous version of the skill, having absolutely no control over whenever or not its Lady or Lord feels really bad. Every time i Draw lady i don't need it and Astro's kit is already covered by so many good OGCD heals that it feels like a pointless addition. Similarly having a separate play button for Arcana is pointless. Both cards are AoE's which don't even require a target. At least with the regular Draw/Play you can make an argument that you can make Macros for Play that specifically target certain slots on the Party List. So aiming melee & ranged DPS is less stressful (esp for controller players) but Minor Arcana can't do anything remotely useful with that extra play button. Get rid of it.
With Divination being completely unshackled from the card system this was the perfect opportunity to make the card effects more unique again. You could still have that Melee/Ranged DPS split but instead of all being flat damage increases you could apply haste or enhanced crits. Instead its still basically just 2 cards, spread across 6 cards due a job gauge that i already complained about. Removing Astrodyne, seal gauges and only allowing to draw Lord and Lady, with the effects they had in ShB would achieve the exact same thing except it wouldn't eat up 7 buttons on the hotbar. It baffles me that the card system gets progressively more pointless with every iteration of it.
Synastry being unchanged is also showing how much attention SE pays to class design. This button makes sense on a White Mage, not Astrologian. It should've been reworked several expansions ago.
I'll still level AST to 90 for completions sake but in terms of Pure healing ill stick to WHM. SGE is more fun to play right now so at least i can compliment SE on finally making me invested in a Barrier healer again.