The problem with your reasoning is that no one cares if you go /WHM or /RNG or /DNC or ffs even /THF except for other COR who can't mind their own business. The only way they would regret inviting you is if you forgot to do rolls.
The funny part is how many "omg, I had this pt with this COR who sucked" threads you see in this forum then how many "no one gives a **** about your dmg" posts. Something's got to give.
I think that most people have merited with enough CORs to have seen the wide range of playstyles and skill levels that our job possesses. COR+BRD support is basically standard at this point, assuming you can find both. If there are still people who don't know what COR can do, i'll have to join their pt and open a few eyes. It gets hard to ignore or miss quadrouple-figure slug shots every minute or so in a pt of any worthwhile length.
On a side note, my ponderings as to whether the gap between good COR75 and bad COR75 was the biggest in game.... have quelled a bit considering my last two parses.
My SAM won a parse against a WAR a MNK and another SAM despite the fact that I ate a nasty pecking flurry and was incapacitated for five full minutes. I was 31%, the WAR 28%, the MNK 26%. You math major might note that leaves not many % left over for the other SAM. TPing n Domaru, Wyvern helm... yikes.
In Nyzul on my WAR, I nearly doubled-up the other WAR in total dmg on a single run. My WAR is solid, I wouldnt call it elite. Apart from skilling up, I've barely used it in the last year lol. Have most of the standard gear tho (Perdu, Askar stuff, aurum feet, BH, Swift belt, brutal etc). Only things the other WAR really lacked were BH and Aurum feet. also TPed in Hauberk which is entirely unnecessary in nyzul.