True, but then for many it's exactly what we want.
I play WoW for it's raid content in decent raiding guilds for many years. I, personally, don't need Blizzard to reinvent WoW every expansion, good raids is all I want, even if 80% of stuff that goes into raid is something I already seen.
It's really like Simpsons, at some point you can't really wow me anymore with raid mechanics, because over 16 years I play this game, I have seen it all.
So I get to see those 2-3 new things per tier in raids, but I am fine with it because I like MMO raiding as a whole as a game mode and WoW is really the best game there is for that.