Overriding Ast Cards.

[Teraluna]

It really doesn't.

Out of all the problems AST has, the cards are actually the one thing that they got right. Don't call for fixes where they aren't needed, please.

The OP raised a problem of the cards, showing that they do need fixing. That's just one issue.
When you see people going through the entire dungeon not bothering with them at all - and the group still successful - it shows they are an unsuitable mechanic for a fast moving and hectic group encounter.

You can say these people aren't playing the class to it's full use. I would say, so what?
These card buffs (with the terrible rng manner around them) weren't needed before with the likes of the WHM. The Ast uses the same re-skinned proven core skills plus a couple of others, so of course it should get the group through with them.
The cards with the pot luck mechanism are slot filling extras, put there to pad the class out.

If people aren't using skills it's normally one of two reasons:
1 - They are ignored because there are better ones to select in the limited time available.
2 - The mechanism is ill-suited to the encounter environment.

The cards fail against both criteria, with players forced to have a quick attempt in the middle of a fast moving battle to see if luck's on their side, then either spamming a not needed buff just for the sake of using it, or ignoring them.