AST's weakness in end game

[Sidra]

It is an issue. You play this game, not the game you wish it was. And in this game the off healer does far more dpsing than it does anything else, and often for extended durations as the main healer heals everything. If SE changes the meta, than perhaps it would be less important. But right now, it is. AST's mana issue while dpsing is a massive barrier to use it is anything other than the main healer.

Well yeah but you just cherry picked the most forgiving MP fight in the game. Check your mana in A3 by the time the final phase starts and you've been dpsing 90% of the time before that, or even in A1 at the first drop and you have a tank to heal after you've been dpsing until the add dropped. It's not a great position MP wise to be in. Especially when the competition is versus a SCH who never has MP issues, ever.

Can it be done by a skilled player? Of course, but that's not really the issue.