...What's wrong with balancing for MD?

Springboarding off the ValenciRodya ""problem"". I'm a little confused by how this is brought up as if it's a bad thing. Isn't 99% of the game spent in mirror dungeon? Why would they not balance for the thing you'll spend most of your time doing?

Story fights generally rely on gimmicks rather than sheer numbers, the only place where you'd care about having the highest possible numbers is MD where enemies roll 50+. So wouldn't it be reasonable to add 2 or 3 statuses to an ID just so they can keep up using fusion gifts? Triple status teams allow dead and buried 00s to be exhumed because they contribute to the status, isn't that a good thing?