This isn’t something that “Blizzard says”. It’s literally been repeatedly confirmed over the past 15 or so years that battlegroups are gone. Why else would you be getting realms who weren’t in your original battlegroup in BGs?
Ally ain’t winning anything with DJL oot and aboot! 
Even those war crates…mmmmm tasty conquest gravy train all weekend.
as a new player I am glad I have leveled characters from both side. I farm wins on Alliance and farm numbers on horde. They seem pretty bad from what I have seen. Just playing unranked though. MAYBE horde is the rp faction?
Game is cross realm queeu right so its everyone?