Yeah well, Blizzard decides how WoW is supposed to work. And I'm sure Blizzard has the discussion every time if they even develop new raids. I'm pretty sure there is hard pushback from accountants to finally stop raids, it's a niche activity and only LfR is keeping it on.
That's a thing I see repeated here a lot, how 10s are so easy, but run 10s with heroic only raiders and you'll see them struggle as much as they do in heroic raids they need 6-8 weeks to clear. Of course 10s are easy for mythic raiders who clear heroic in week 1.