Not at all. I personally would prefer to raid with a group that doesn’t require hours of farming/week to prepare for it, have class racial requirements, and completely excludes some specs for the sake of shaving a few minutes off of raid night.
Ret is an objectively poor performing spec, and I could see warrior or rogue players leave raid groups if they were rolling equally on the same gear. It’s up to the guild/raid to make those decisions.
Just like some raid groups prioritize DPS over healing, and would not let HPals roll on Mageblade, until after the mages/locks had it.
I personally am not raiding for world firsts, or to beat clear times, and am just there for fun, to clear content, for some gear upgrades, and really to experience gaming with my guildmates.
I like the type of guild that has ret paladins, enhance shaman, and even balance druids, provided the people playing those characters are ok with having low meter numbers and the raid is clearing content 
This thread was quite recent:
It would be very interesting to see if what the OP of that thread seems to believe would actually be true.