Ever since Shadowbringers I cannot on the life of me bring myself to want to touch AST beyond the bare minimum now (leveling it). Even as of 6.2 they've confirmed they still can't stop messing with it (albeit it still needs fixes, of SE's own fault).

My main healer is Sage now though it's not like it's perfect, I just have less complaints about it compared to the other ones. Back in Shadowbringers during a brief static with a friend I even showed reluctance to heal for it, so I didn't. Strange since I was more than happy to heal for a savage tier (though in Stormblood the only tier I did was delta). Healing has basically become a dungeon grinding job for me for fast queue times for tomes, when in the past it was more than that to me.