While this by itself would be a bit of a lackluster change, I think it would be a good direction for the change. Currently MCH rotation requires aligning every single ability for Overheat and Wildfire. That means there's actually just one job mechanic and the entire toolkit is bound and locked into it. The result is that any delay or mistake affects the whole rotation.
This is in stark contrast to something like BRD or SMN that have rotational segments that work independently of one another. BRD has its song rotation as a base, each song has it's own internal mechanic, and you have a burst phase that you align with your best song and Barrage. Messing up the timing of one ogcd here or there barely has an effect on the rotation as a whole. SMN similarly has its DoT refresh cycle, Aetherflow cycle, DWT phases and Bahamut burst phase. All of them are linked to each other through Aetherflow, but have great amount of flexibility in their timing. Even RDM has their spell rotation and melee combos, but their physical ogcds are not tied to any particular part of their rotation.
It would be a healthy change to decouple some of the mechanics from Wildfire to make the rotation less error prone.