I read an interview recently that stated they're aware that AST needs some balancing, but they don't want to overpower us. For example, if our heals had more potency AND the buffs from the cards, a group with two ASTs would be too powerful.

When AST first came out, and no details were really released, I inferred that the cards weren't going to be buffs but actual healing spells.
In regards to "potency," maybe they should add two cards. A single-target burst-y heal and an aoe heal. That we could Spread if we know we may need it soon. Because getting it would be random (but would definitely happen at least once on a boss), I don't think it would make us too op.. Of course, that means there's diminished chances of getting one of the other cards. But I hate Spire and Spear anyways. Just throw those right out. :P
I just wanted to chime in and meet other Astrologians who enjoy the class. I can't wait to see what the future holds for us..

... get it?