So you also want to be able to choose your dungeon at will, it will be never be done … because people go for the least resistance path: 90%+ of the key done in pug will be Mists just because it is the fastest (& pretty easy any week but tyra-explosive), and places that are already less appreciated (such as SD) will never be done in pug, ever. The devs wants the M+ experience to be all dungeons relatively even, not one or maybe two dungeons that are run 95% of the time.
But you can put your keystone with anybody you are not denied the opportunity, however this is challenging content you are responsible for the people you bring with you
That is way I said “another layer”, it will not replaces toxiticy, it will add a bit more. Plus anybody who ragequit the key severely reduces the odds of success, not just the tank. Thinking you are better than anyone else because you play tank & you lead the group is blatantly false, this is just an illusion from lower key because most mechanic are soakable & dps check is pretty easy, therefore most fail come from tank death or atrocious pulls.
This is atrocious, I don’t want to run every dungeons 10 times on every garbage difficulty below +10 just to “prove” that I can do a dungeon ( & every season do it again lol), the system is good enought as it is, you level up your key really fast if you are stomping, then you stagnate at your level, until you decides to pump up to push.
& Imagine you want to start a lower key for a friend, yeah nice now farm back 10*X times to gain back the level of your key.
& What is your issue with “practice” ? You can hop in whatever key in pug & practice for there, especially in low key the level does not matter that much (11 or 12 is pretty much the same). There is no lack in dungeon application so there is no lack in practice. Up to point where you need a team to progress of course