But it also means to compete in M+ you need to raid mythic, something very odd considering even a mythic + team usually wont have more then 5-6 people on standby, thus lacking a good 10 people to hit that 20 people mark. also unlike mythic + you NEED to have them on your realm group for the raids so you cant even try to find likeminded people in LFG which is per the usual for the M+ group.
Now I guess they can just incorporate a preset gear max to M+ so raiders don't get an advantage in this field, but lets remember how well that worked for PvP... everyone needs a carrot to chase. Another option is to just let gear continue to scale up past 15+ (to say +25 or something) So it's automatically harder then Mythic raiding to get equivalent gear, at which point who the hell cares what the Mythic raiders think if they cant beat the harder content to get at level gear they need to "Get good"