Due to the rng nature of the director sometimes sending a lot of bs your way, like the Storm Fiend/Bile Troll coming in the hallway so you try to back up into an open area and a horde spawns along with a ton of disablers who IMMEDIATELY start grabbing people instead of giving a warning cue for a few seconds first, not to mention various bugs, and so on, at end game play you will end up with very angry toxic players because there is no more progression and chance for reds is so slim.
Progression or some sort of cosmetic or reward takes the sting out of losing to rng or even just self mistakes or weak teammates. With the odds already being so low, players who have gone a long time with no reward will get very upset over the loss of a single tome or grim, or even any misplay that puts the books at risk.
You will be able to easily observe this for yourselves in the coming weeks if not already. The people you used to have fun running with will complain much more about any mistake, once they’ve gone a while without any loot reward and all their attention is focused on gameplay minutiae alone. You could also simply do an analysis of all the forum posts to prove this for yourself and not have to take my word. Just count up the people complaining about toxic players the past two weeks and the coming few weeks and measure the increase.
This won’t be because a bunch of buttholes suddenly decided to start playing v2, just that more and more people are running out of progression potential and don’t get any red/cosmetic drops proportional to the time and effort invested. Losing a silly map but still sometimes getting a hat from a commendation chest makes it ok. But since the reward that would nullify the frustration is so rare, people are going to take that frustration out on other players when nothing is there to cancel it out.