I would agree, with the exception that M+ is a group content and Delve is a solo content (that you can still run as a group).
That would probably drive away from M+ people that only run M+ to get Myth track items. I think this could actually adjust the content for people that are interested in doing it.
I just don’t mind people getting gear in the content they do.
When PvP awarded better weapon ilvl in Shadowlands season 1, everyone paid to get carried to 2300 to get their 233 ilvl weapon. There is even videos of Blizzard’s MDI cast paying the carry.