But if it would work so that it only gives from what you do, it would be bad as well, since you would technically need to avoid a ton of dungeons then on some classes.
Imagine you get a key and you cant do it, because then your vault will have more chance to drop bad stuff.
The best would be if vault was simply not that important for m+, as it is now.
I still think each dungeon should be able to drop mythic track at the end of the run, once per week like in case of raids.
This would decrease the important of the vault and would fix the disparity between raids and m+ regarding the mythic track gearing.