https://www.bluetracker.gg/wow/topic/us-en/7200052820-joinbattlefield-post-51-part-2/
Some of it:
We decided to make this change in order to improve the experience for all players who are queueing into random groups normally and expecting to face similarly random groups, only to find themselves crushed by a full team of coordinated opponents.
We understand that players want to enjoy coordinated team play, and we invite those players to queue into Rated Battlegrounds or play Wargames to have that experience.
The normal Battleground queue is for players to jump in and play against other players in a similar situation. We realize that it’s not a perfect system, and we’re still looking at ways to improve normal Battleground queues further. Regardless, it’s not meant for organized groups to “pug stomp” and get quick Honor. We have built in outlets for players that want to organize–if a competitive, social experience was really the goal, then there are clear ways to achieve that.
The ultimate effect that this kind of queuing has had is to drive players away from PvP. Perhaps it’s been a long time since you’ve been in a random group, but a lot of players will see that they’re up against a premade and simply quit. At best, they suffer through it. To an extent premade groups count on this. Heck, one of the popular addons announces opposing players that appear to have rage quit.
For as long as there’s been Battleground PvP, there have been players looking for a way to destroy their enemies to quickly and easily get fast rewards with a minimal time investment. That’s the bottom line here, or the variety of other options available would be more compelling.