Monk is one of the top damage dealers at the moment, and as has been said in this very thread, is currently seeing a LOT of play right now. It may not be perfect, but it's pretty damn good at the moment.

When I think of jobs that need some TLC, Monk doesn't even crack the top 3. Ninja and Summoner both need rework, and the complexity of the jobs do not match the damage output. The entire role of physical ranged dps is in major trouble right now as many people are looking for reasons to even bring them into high end content (similar to where casters were at the end of heavensward and stormblood). RDM doesn't feel as rewarding as it used to, got two skills that are entirely circumstantial, AND is the 2nd from the bottom DPS. SAM needs some potency buffs and is getting it's shoha reworked (which it needed).

This is before we address the current complaints for Tanks and Healers (which are admittedly both in a decent spot atm).

Doing heavy rework on monk would take away from the resources needed to adjust other jobs that need a LOT more work than Monk currently does.