Not sure what your point is.
Are you saying that there shouldn't be content aimed for people who actually like some difficulty?
There is already LFR, Normal and Heroic modes for raiders who aren't able to challenge Mythic mode.
Should we stop people from doing Arenas once they hit a certain rating level because "Oh shit you've done enough PVP this is getting unhealthy"? C'mon.
My point is that there is a market for difficult content. There are plenty guilds that clear it with a variety of time investments. Even if you don't clear all the way to the end boss, there are loads of guilds who clear maybe half of it and find some achievement in managing to get through 5/10 or whatever else.
It'd be dumb to remove the top tier of content just because some people find it too hard. Duh, it's meant to be hard.