Once again, the suggestion you have is for a system that is wholly unlike anything in the game currently. Raiding goes without saying. M+ was an iteration of Challenge Modes. The closest thing to what you're describing is MT but you've mentioned both solo dungeons and solo raids at various points of this discussion so that would be quite a departure from anything Blizzard has developed thus far. And then on top of making a vague, broadly defined suggestion, you are now perfectly fine with knee-capping the rewards from this gargantuan development effort on Blizzard's part at a item level that would make this brand new system use-case almost non-existent. It seems like a lot of effort only to have the feature end up like the Brawler's Guild. If they're going to make something like this a thing, it needs to scale up to Mythic level or nobody will engage with it. And if it does, the problem of this new solo content taking away from people currently doing group content is once again relevant. Your insistence that the solo progression gear stops at Heroic item level seems like a cop-out to defeat the concerns I have without addressing the fact that if it were rolled out like this that engagement with the system would be nearly non-existent.