Starting off with whats wrong with mythic plus , yes you heard it right its key depletion , why do you think people get frustrated and becomes so toxic ? its simple , key depletion , there is pugs all around the globe , that struggle with either their hands , performing bad during too much stress , its understandable but the sheer amount of time waste you get into a key is just abysmal , first you get a key depletion , second you get 50 gold instead of an actual piece of gear , third you rethink your life decisions cause of wasting 30/40 min of your life just for fun i guess ? well i wish it was fun at least if i looted my bis trinket , or item.
So in conclusion lot of the frustration built up on players will be removed by removing the key depletion system , maybe make it unable to be depleted till 10 keys , i mean there is two communities in the game , you got the “raider io enjoyers” and the " i wanna play the game and not sweat 24/7 players" , which is i suppose the bigger playerbase , i mean blizzard is a big company , they can manage to figure out how to fix the pug scene toxicity , and let people interact a bit with humans , cause every key holder just sees the players as assets and tool , nothing more , if someone mess up its like the end of the world , random slurs being thrown , and bloodlines being insulted , just cause the dude gonna get from 7 to 6 key level and wont be able to get the hero gear anymore , and will have to grind again , until he deplete the 6 key too and now the dude is on his villain pug arc.
Also this could also fix the fact that , players can practice the key level to get better instead of making it easier and you wont learn much from the previous key , it could help improve the pug scene lot.