An M+ compromise I think both sides can be happy with

Maybe pre-hall of fame have M+ drop heroic raid level gear to prevent people from loot funneling but once the mythic hall of fame closes, the ilvl of the M+ drops increases with mythic gear dropping from 20s.

This why its still challenging content for mythic level rewards from M+. Just an idea.

Or they could just remove the loot lockouts on raids. Then people could farm them just like mythic+ content.