Honestly, it doesn’t even matter why.
Blizzard just doesn’t have a soul anymore.
And then you have the sheep so focused on convenience that they don’t even care about the longterm effects on the game itself.
The way it is now is a retail formula. It won’t take long until people simply choose not to talk anymore, and then you’ll get a dungeon finder-esque experience in BGs like in retail. (I’d say it’d become like random BGs in retail, but who even does those anymore…)
There’ll be yelling. There’ll always be yelling. But the way to counter social toxicity is by making it into a more wholesome social design. People tolerate more when they aren’t complete strangers, even something as small as simply seeing a player in a major city from time to time, or just seeing their name on your team in BGs occasionally and it’s actually possible to remember it because it isn’t being filtered out with all the junk names your brain can’t remember anyway due to limited mental resources, can impact a person’s subconscious willingness to ASK instead of yell. Due to the forming of social awareness.
It’d effectively reduce the amount of “toxic behavior” if the social design would be done better.
You can find examples of that in this report:
https://www.projecthorseshoe.com/reports/featured/ph18r8.htm
The more anonymous it becomes, the more egocentric we act.