Because there is no logical ending to an aesthetics criticism
If I said I wanted DRK’s 1-2-3 to look like sailor moon’s transformation would that be a valid aesthetic criticism of DRK that is worth considering changing DRK for
No of course not I’d just be told to play a different job
Aesthetic criticism just really isn’t a valid reason to change a job because it doesn’t affect gameplay. It’s the same reason why it’s pointless to argue against others taste in glamour, because you don’t have to wear what they are wearing
The only time I’d really argue aesthetic criticism is valid is a situation like modern healers where all 4 options are “UWU I'm h-h-hewe t-to make aww youw wounds nyice and bettew“. However casters are visually diverse so you have options