The issue is AST is already OP. Having to choose sects is one of the job's few drawbacks, and even then you can still kind of cheat a sect by casting a regen or shield prior to engagement, and then switch to the opposite sect. It's not a huge edge, but one that no other healer has, adding to AST OPness.

I could see something like this if AST needed help, but right now it seriously does not need any help. The only issue AST has right now is solo play because the card gimmick and abilities like Earthly Star seriously lose their flavor here. Jobs like AST need challenging content in order to shine because nearly all their abilities are structured around group play.