Comparing my BRD to my MCH dragoon-less A3S is like... ~70 DPS diff comparing one of my best A3 clears on BRD to a sloppy MCH clear where we had like 10 deaths and I have really limited experience playing MCH in raids, MCH's personal DPS is really quite solid in the face of bard though I think A3 is favorable for MCH thanks to bishop turret and extra stuff like grenado shot in add phase.
BRD can fall behind MCH off of mistakes comparable to messing up wildfires too, though it's hard to make a mistake on BRD that you can say is as huge as screwing up a wildfire really badly. That big of a loss on BRD would be more like a bunch of mistakes combined.
It's just that WF is such a big part of competent MCH DPS that a buff to it like what you're suggesting could potentially set it well ahead of BRD.
