Easier difficulties exists to make raiding accessible to everyone, instead of what it was for the "hardcore" back in its day of Vanilla. That is in no way a bad thing, it means more people get to enjoy it. Sorry if your little exclusivity club got shattered, like how barely anyone did Naxx40. And let's be honest... the only genuinely hard thing about Vanilla raiding was managing 40 players in a raid.
Seriously though, your argument has little to no substance. Yes, you can do the easiest difficulty... but don't claim to proceed and call the game easy when there's Mythic and Mythic+... just makes you look terribly foolish.