Skimmed through it. Between MCH and BRD having WM/GB, I still feel like that WM just causes more problems for BRD in the long run compared to adding anything meaningful in relation to MCH, after listening to how MCH can bank their QR cooldowns and hold procs to still remain motile, while BRD is more stationary.

Their competition of roles could be comparable to that of a BLM/SMN (or even melee if you to make that jump). Their purpose is to dps, but how they come across that is different, in both their sustained dps (DoTs and aetherflow timing vs enochian and astral/umbral cycling) and burst through cooldowns (Derpwyrm vs ley lines sharpcast usage).

In regards to BRD/MCH, I honestly feel that the differentiation only really comes from their burst (Beethoven simulator for wildfire VS stacking cooldowns for empyreal barrage), but beyond that, their down-to-earth sustained dps becomes incredibly similar with each other, movement from instant casts aside (which only really matters for some of the end game encounters, and negligible in everything else). The turrets really don't really mean much as far as gameplay is concerned (you have very little interaction with it) as they're mostly place-and-forget (especially when center placements are enough to cover the entire boss platform for the regens).

They could have very well kept MCH as the motile class with BRD being more stationary (assuming they fix the procs and oGCD clippings), but realistically speaking , the mobility itself doesn't account for a whole lot if it becomes something like a toggle stance (the class should innately restricted in mobility, like BLM), because giving that sort of stance (to both jobs no less) really kills the differentiation and homogenize the two even more when one aspect (where you're forced to move to deal with mechanic) isn't present. They had mentioned that previous encounters encouraged BRDs to deal with mechanics, but they're the ones that a SMN can do just as effectively (t7 renauds) or the entirety of the time the BRD themselves is incredibly gimped in dps (T12 bluefires). Tl;DR : Mobility should not be the thing that sets the difference between two jobs, let alone MCH and BRD who are innately motile and gain a stance that somewhat strips of them of it.