All this tells us is that you still spent a lot of time playing. You’re not the average player. That or…the average player is obsessed. Are they?
I’m inclined to agree, but only insofar as to the OP’s question. M+ is ‘inactive’ right now because community perception is that it’s difficult, so most players are staying away from it for now and sticking to what they know is going to be trivial or at least easier than that, which is…pretty much everything else, until they get more powerful.