I'd like to see whether they checked how many of these players (AST, I assume) truly used the job at its fullest potential, not just for raiding content. I mean, did these players come to the content just becuase they knew AST had a card that could buff their party? If so, did they only think of "Balance"? As mentioned, cards like Arrow or Spear could buff your damage as well. And, yes, I know, balance is flat damage %, but arrow meant more SkSp/SpSp so you could use abilities faster = more damage; Spear being the least favourite as it did not mean that crit % ensured a critical hit.
So I see two possibilities, although there might be more, for this:
A- either they listened to players who complained about "useless cards" but were not ASTs, which means that they'd rather listen to a mob even if it means ruining the experience for people who enjoy playing AST, and forcing us ASTs to do their bidding just because they greed more DPS;
B- or they listened to ASTs who complained about "useless cards". But then again, did they somehow check these players played AST in other situations/content? Did they listen to ASTs or other players who did not only fish for balance? It's easy to complain and be listened if you gather the right amount of people who do what they do (fish for balance, think other cards are useless, talk to people and make them think that if they stick together and complain in a united front they'll get what they want).
On a side note, the RNG aspect seems gone with the new AST. Prior to its update, you didn't know the card-effect you were going to get and had to adapt. Now, it's simply a matter of selecting the right job for the right card. Don't like the seal? Redraw. Don't like it either? Redraw. No likey? Redraw! (Shocking). Still no? Major Arcana. What I mean is that whatever you do, it doesn't feel RNG, it feels feeding DMG and whatever you do, you'll end up with three seals. In the past, you had to work to get the best out of it.