For Phys Range I think MCH can be brought up to at least PCT levels, do a similar system where its filler is mediocre but it has incredible burst damage.
I know machinist already does good nDPS but the current game boils mostly down to rDPS. For Bard and Dancer though I really don't know what can be done to fix them besides a full role rework because their support and utility is not worth it compared to the damage and utility casters bring and with Bard being probably one of the hardest jobs in the game its really not worth getting good at because Dancer does its job just as good at an equal level with much less skill, what people are saying about BLM and PCT actually does exist in DNC and BRD the skill floor gap is so much bigger but theres zero reward in getting good at BRD.