the point is, in wow pve has never come down to skill - vanilla the game was new, DnT, SK, nihilum were all putting in heavy hours. TBC - alts became more popular, but content was much more steep as most people didnt even smell sunwell. naxx - long raids and limited tries per bosses forced alts gearing. cata/mop - we wrote freaking addons just to manage ragnaros, spine, zonozz, sinestra, etc, mop was just an alt-fest and gimmicks like mages rotating ROF in vaults, just off the top of my head.
in pve people confuse skill and optimization. the former does not exist, because every class/spec has been extremely theoritisized and simulated since tbc, the goal has always been optimizing your dmg. Tanking and healing has always been fixed as you always rotate cds be that tanking or raid-wide.
im not saying the system is good, but MMOs usually come down to who can grind the most. you want skill, play csgo and dota2, because there skill means a 6 digit paycheck per year.