While this is basic statistics and factual in terms of numbers: It doesn't change that it's not enjoyable to play as a card game, takes way too much time away from healing, and is literally painful and requires a frustrating amount of effort to play well with controllers, which is why there is a recorded drop in AST players in statics. They would have to rollback the ogcd timers and potencies, and restore royal road or add an "potency(.7) to all party member or within AOE radius of targeted player" to just deal with the issues for controllers and reducing the time allocated from healing. And, the card game aspect was basically just calculating risk/reward on the spot based on player jobs and card that was drawn with abilities to help manipulate the results, which is what is seen in TCG's deckbuilding. Also, totally what Boomsmash said