Game is basically raid or die again. Progressing past ~855 ilvl without being a raider is nearly impossible without insane luck. Mythic+ doesn't drop much loot and you have to do +6 or higher to get guaranteed 855+ loot, while being pretty difficulty to do in 845-855 gear. To do higher level M+ you're basically going to have to be in raid gear and be a raider. Anyone who does mostly M+ and world quests will be ~855 ilvl at this point.
Meanwhile, heroic raids are dropping 865+ and mythic raids are 880+. Anyone raiding will be 860+ ilvl at this point. As time goes on, the gap will get even bigger.
This is why we're seeing a lot of threads like this:
"Flawed gearing system I'm stuck at 845" (
http://www.mmo-champion.com/threads/...ck-at-845-ilvl)
"RNG brickwall" (
http://www.mmo-champion.com/threads/...-RNG-Brickwall)
As more and more people progress and get to this "wall", it will become more apparent and wide spread. It will become more complained about more and more as more people reach this plataeu of gear.
Game is raid or die again. The devs of this game can't get over their outdated archaic raid or die obsession and are going to kill their game two expansions in a row by catering too much to raiders and not giving non-raiders proper character progression.
Mythic +7 gives 855 BASE items.
Mythic +7 is as hard as heroic EN, perhaps harder to beat timer on in certain dungeons.
Game does not reward you for doing difficult content, unless said content is raids.
The devs are HEAVILY biased towards raiders.