Well for days i was thinking about posting a topic just about this issue but fearing the incoming hate, i got discouraged..
I had an idea about a guild that letting oddballs / misfits in its raid group, i am not talking about a raid team that full of ''fun'' specs, but i really do believe that every single raid (maybe not naxx) can be completed with 30 out of 40 conventional specced characters and 10 oomkin, ret/prot pala , enh/ele shamm etc.
Considering the game is now 10 years old we can expect for such a player ( that a player know the responsibilities of playing a gimped toon and in the knowledge of he/she must go tryhard mode and farm twice more than its more accepted counterpart ) will be much more useful than a slacking geared pure class..at least much less annoying, and already studied his/her boss well.
I mean we all know or already experienced that among 40 ppl, there are always 5 to 10 ppl that are intentionally slow or geared with half of a brain. And still being carried by the rest of the team.
I know there will some ragings by the wanna-be-veterans '' durr! Vanilla is hardcore m'kay !!1!1!!? ''..
But face it and swallow it; Vanilla is far from being considered as a hard game..mechanics are mainly straight-forward; get out of of the fire, kill the adds, decurse/dispell, and of course MOAR DOTS! 9/10 bosses or encounters can be completed by monkeys even and the last boss of this era is known inside out by the players even there is a good 1 year before the release.
Also there is a human factor, call me naive but i believe that an oomkin or an enh sham will focus much more to the game than playing as a resto, and for sure will be having much more fun, thus less drama.
There is much more to be written but this post has already evolved into a wall thus ill cut it now.
tl;dr, I think server needs at least 1 guild for each faction raiding with space chickens shooting lasers 'n shit. You want a hard game? That's how you get a hard game.
ok.. you may crucify me now..

Side-note: No i have no interest on any of the before mentioned specs so this post does not serve ant selfish purposes.