No idea how hk farming as a premade can be any fun, it's like playing friendly soccer match and taking best players against goofy nerd players and winning by 100-0.
When I play soccer match we try to mix players to get equal teams, thats the only way to get fun from it. Same story for battleground, win/lose don't matter, but every battleground same as soccer match differs a bit, no idea how it can get bored anyone, for me hk farming is the most boring part of battleground.
Im playing this game since 2004, If I would gather all hks from all chars and all expansion I would get probably a few millions of kills, yet im not bored with bg where teams are equal, for me this HK farming and afking on graveyard is abomination of battlegrounds.
Not sure if I should despise or feel sorry for people who get fun from it, it's simple dishonorable, they got some mental problem for sure.