All raiders will do it, when you cannot progess content without doing it.
You wont see it in Normal no, in Herioc you will.
Not even a “Family Guild” is going to sit there being 4/12 Herioc because half the raid team has a bad Covenant.
People think that Icy Viens and the like are for Mythic Raiders, its not. The Mythic guys dont need a site to tell them. The Majority of this community Uses Icy Viens, Wowhead, Streamer, Guides to play the game optimally.
The 1% is not doing that.
If you take a brief jump over to World of Wargraphs, and you can See that over 60% of the active max level toons are FOTM specs. An Extreme Minority is not FOTM. Non FOTM specs have like 1% or less representation, VS DH sitting at 8.4 and BM hunter 7.3 while Surv sits at .5%.
Its obvious to see who the minority is here, and its not the “Meta Slaves”. Its also obv to see this isnt a matter of “thats the spec they like” as when you flip that chart to PVP, it does a complete change, where BM Hunter is 1% and Surv is 2.2%
That seems to be the ultimate issue. The “Casuals” which I use that word lightly, as they are not even that tbh. Actually lets call them the “Non Conformists” who think they are this HUGE portion of the player base, are actually a very very small portion of it.
We were pugging a 3s healer the other day, and someone slipped in as holy without us realizing it, we realized it when he was dead 2 secs into the fight. My buddy was Group lead, and I asked him, why didnt you check he was disc, and he said “Whens the last time a Holy Priest has even bothered Qing, I forgot Holy existed”. He is right, because 99.999% of the time when you get a healing priest its Disc. Because using the completely broken worthless spec, is not commonplace.
To be clear thats not to say there is not some high rated Holy priests. There is some people that play holy, and always have, and do so at a exceptional high skill level, where their skill carries the bad spec. However, they are VERY few and Far between. Those people are TRULY, the 1%. Maybe that holy was one, however after watching him die in 2 secs into the match, and us losing rating for it, we dropped him like a bad habit.