This is the heart of the problem. Mythic +6-10 last season provided a nice environment for less skilled players to learn and gear up. It was punishing enough to fail keys sometimes, but still easy enough to be carried by high ilevel. It was also a nice range for undergeared alts of high skilled players to join and carry people in.
Blizzard basically removed that content, so there’s less of an on ramp for lower skilled players to go and learn. Heroics still don’t teach anyone anything, and the new M0s are a wall that requires gear or skill to play. It’s exacerbated by the 1 week lockout, so even if you get through an M0, you can’t run the same one again to get more practice and familiarity the way you could with the old +2 to +10s. Hopefully Blizzard dials things back a bit for TWW and makes it so M0s in Season 1 there feel like the old Season 3 +6 to +10s and then the key crunch can continue on.
I think most players would appreciate one more rung in the ladder between Heroics and Mythic+ to learn and practice in.