Many of the harder encounters in WoW have taken top guilds over *500* attempts to defeat. Game is easy bros, no skill involved. It's not like encounters ever do things that throw you off from that pre-programmed optimal rotation that you don't ever have to tune specifically for your current gear on your own. Easy peasy. There's nothing to throw off your timing, and because everything happens in every rep of an encounter in exactly the same way and there's no RNG factor whatsoever, you don't have to make any sort of adjustments. You've got mods to tell you to move when it's already too late to move, or mods that tell you what ability to push that are usually one global behind and will never get you that last 2 or 3 percent you need to beat enrage, or mods that cover your screen with information that you can't possibly track along with all the other crap flying at you. Hell, just crafting a UI that presents information in a way that you can follow is a one size fits all thing that you can just download pre-set and never have to adjust.
Sure, a lot of this goes away if you aren't pushing to be top 100 or even top 500. But there's a major catch-22 - if you don't have the kind of players who want to push for a high ranking, then you aren't likely to have the kind of players that are able to complete heroics in a lifetime of attempts. And it snowballs. Not really interested in heroics? Well then you'll wind up with people who get their shit pushed in by normals. Having a hard time with normals? Well run a flex pug, and set the gear score 40 points higher than you actual gear so the pugs carry your fail shitfest to victory.
Anyway, all old arguments that non-retards already understand anyway.