With the latest changes of wowprogress M+ score calculation which basically makes "not in time" keys really low score, I can see a big problem:
People tend to leave now if there are some wipes / deaths and the key could be potentially "depleted".
Saying this as someone who is 2,4k 7.2 (only with random pugs). So I have quite "good" groups, but still this annoys me somehow. I also talked to some friends which I know from M+ and they have the same feelings.
As an example: My Maw of Souls 14 with 2 chests is worth more then the MoS 18 I did (not intime).
So ye... basically the people got more toxic (I guess) and leaving. I dont think thats a good thing what wowprogress did there.
Btw I dont say this problem hasnt been there before they changed the way they calculate the score. But now it happens much more often.