I can understand why healers on the cutting edge would prefer the new AST. I don't think new AST is more fun than old AST, but it must be stressful healing content at the very highest end where you don't have any room for error. In that circumstance, wiping because you drew the wrong card would have to feel pretty awful. That said, even if the new system works better for those at that cutting edge, that doesn't mean it works best for everyone, and content should be designed with everyone in mind, or at least a majority. I have faith that if SE sat down and really devoted themselves to it (and read the healer forums and playtested it with actual healers) the could come up with a system that was more reliable while also being fun for a wider array of content.