Speaking strictly on AST, because it's the only thing I've worked on so far:
Is the card system more fun? No.
Is it necessarily a better kit? No.
Does it relate to the lore? Nah.
Is it a cohesive kit? Yes.
Getting the same card 3-5 times in a row isn't unique to the new kit, it's something that happens with RNG, it's something that happened with the old kit. As for your seals, you only gain them while in combat, and you don't enter combat until you contribute healing or damage. Furthermore, the player you're buffing must also be in combat.