If you one chested any Mythic+ currently then you would only get 2 pieces of loot. What is your point exactly?
You can look at the changes and say "good change" because of the problems it fixes. You don't have to farm lower levels to get max loot. You don't have to find overgeared pugs for the higher keys just to make sure you 3 chest it. You don't have to worry about people leaving to depleting your stone or even depleting it in general.
Reg Mythic is also irrelevant considering it's a lower ilvl than Mythic+ loot. It's not going to compete with raid loot in most circumstances. Sure, I can agree that maybe 3/4 pieces of loot (3 standard 4 if you do it fast enough) might be a better change but I'm not going to pretend like the changes don't bring a lot of good and that M+ is ruined because that would be ignorant.