Moana you keep contradicting yourself. You just said that progression is about getting better gear but then you turn right around and claim that raiding is not for "progression of gear" it is for pure challenge and enjoyment. If the game is about progression and that means better gear then that means Raiding, which is also a part of the game is included as part of that same progression. And progression in any game always means harder content rewards better items and gear. Even FPS games have that concept where the big bad mega gun is not given out when you first start but only after getting through increasing difficulties before getting to the big boss.
So you are worried about what other people are doing and how other people play the game even though it matters little to what you do. How on earth does a mythic raider getting 930+ gear affect you if none of the content you are doing needs 930 gear? And why do you care? And the point I am making is that Blizzard could perfectly well make tiers of gear that corresponds to tiers of content but this current formula in legion of overlapping tiers of content and anyone can get any tier of gear just by luck from doing anything makes absolutely no sense. Everybody in the game should not just get the same gear just by doing random content with no correlation to difficulty. Getting a random RNG boost on some random encounter that is not difficult is not memorable and really wastes the experience.