BRD and MCH are both ranged dps, so they basically have 100% uptime on enemies, so it is understandable for them to be a tad weaker. But when comparing them to each other, one is clearly the better choice.

Based on stand alone utility AND damage according to the SSS dummies, BRD destroys MCH.

BRD has:
Party wide Crit rate +2% with 100% uptime
3% damage buff with Foe's that last 7 server tics or 21 seconds that can be reapplied approximately every 2:30 minutes
20 second 15% direct hit up every 3 minutes
A 45 second instant esuna
A 10% magic or phys vuln for 30 seconds every 3 minutes
A 15 second single target mantra(good for tanks)

MCH has:
A 5 second 10% damage down on one enemy every 90 seconds
A 5% damage up for one or all enemies for 29 seconds every 2 minutes

Then they both also have mp/tp regen and a 20% phys down for 10 seconds in cross role.

Do you see a problem here? MCH needs to do significantly more damage OR needs significantly more utility. You can't tell me this is okay when it is very clearly not.