I figured out the state of MCH

[aiqa]

What about the fact melees are balanced around having an aoe damage buffs or not?

That is already included in the rDPS metric.

So what does this tell us?

MCH already does way higher personal AoE damage than either BRD or DNC, and doesn't do badly compared to most other jobs. But raid buffs are not balanced around AoE in raid content. Compared to other fights it's not that MCH underperforms hugely in M6S, raid buffs are overperforming. And I doubt it's possible to reasonably balance that by buffing MCH AoE damage. To get MCH, BRD and DNC similar rDPS in every fight, they'll need similar ways to contribute to rDPS. So all, or none, need raid buffs.

all of rphys is trash tier

Pretty much yes. Even with their hugely overperforming raid buffs in M6S, BRD and DNC can barely keep up with other dps roles.