With regards to Ast changes that need to happen this expansion
- controller issues, this has to be addressed, 8+ macros should never be preferable to using it naturally. At that point there is a design problem. There are two ways to sort this, rework the targeting system which is a major overall so likely expansion only so it is out, or rework some of Ast's abilities a more likely scenerio since it'll be constrained to Ast alone rather than affecting every job.
-mp issues, some manner of secondary mp gain, there has been plenty of suggestions all rather easy to implement as well, devs just haven't bothered to think of one do bare in mind this was also said since 5.0 and the tweaks have been laughably bad to combat this, at this point it feels like intended Dev design.
Anything else can wait to 6.0 for changes like card system etc but they will probably tweak it just look at 3.0 brd had to wait to 4.0 for the loss of bow mage people liked bow mage but bow mage was unhealthy for the job as shown by brd in 4.X (other factors like crit meta etc were a thing but it is more about fun factor than numbers as evidenced by current Ast numbers best rDPS hlr btw still the least played by a huge margin).
5.X ast is 3.x brd to me an experiment to see what can work, that ultimately failed in its execution. I actually expect changes akin to 4.0 brd in 6.0 for ast there is a big enough stink like with brd from the vocal minority