I agree with everything else you said, and I WISH I could agree with this, but the ugly truth is that ASTs are going to get placed in parties with generally crap players, the same as any other healer will.
When that happens, the cards aren't going to do a thing to save them in situations when serious emergency healing is needed and the AST just won't have the tools to do that.
Again, if the party is competent, ASTs can heal anything pre-savage without issue, but so can any of the healers and I've been able to do some pretty beefy DPS as a SCH in Alex, thanks to SCH's amazing mana regen and the fact that you can spec to have six friggin' dots (both miasmas, both bios, Aero and Shadowflare). There's no way I could pump out damage like that as an AST, and especially not without going OOM like crazy...
