Dear God, who thought nerfing tank threat by 80% was a good idea? Finding a pug tank is hard enough as it is. Now imagine how much worse it's going to be once idiot DPS in every group scream at the tank for being "bad" because they can't hold aggro. Even if the tank is good, do you really think most random DPS are going to watch their threat? Absolutely not. The mentality of players now is absolutely nothing like it was 10 years ago the last time threat management was a thing. The result is no tanks are going to want to join group finder m+ pugs anymore.
Sure, the change is fine if you happen to have a dedicated group of friends at your beck and call to run m+ with, but people who rely on the group finder are pretty much fucked.