Jobs may be far from perfect, actually they're closer to a bad state rather than a good one.
But positionnals are MNK identity. If you remove the "cool things" from DRG, SAM and NIN, they would have barely anything to bother with due to their low number of positionnals.

Positionnals are the bane of casuals and the last bit of fun for veterans. As a casuals, you can ignore positionnals.

You feel like MNK is broken? Laughs in MCH
Boy, MCH has artifact actions and the job rotation doesn't change at all from 66 to 80 and there's so much more issues.
At most, MNK feels empty and barebone and you can only cross your finger that all job will finally feels as complete as DRG or BLM.