Bruh... like, why the hell does a defense-oriented class, let alone the "best defense class", have a attack reduction ability as one of its earliest skills instead of a defense buffing skill. And that's not even mentioning reducing enemy attack by 20% for 1 minute. That's literally a meta-level offensive ability in any RPG game, flat-out not even questionable. But if it's possible to stack attack reduction then that's meta changing because people can just do raids with all high defense and stacking attack reduction to a boss to the point the boss will literally become powerless. Also 1 minute of fighting (irl or in-game) can change the fight entirely, after all have you seen boxing matches? They usually last 3 minutes, so try having a boxer not allowed to punch for one minute and see how many seconds that fight to end
Jesus I see why heavy knight is considered the "strongest" class, because it can just straight up break the game and make all other classes look like trash with no effort.