Bind demon is bm so we just dont play with ppl using it, not a huge problem for balance. It's annoying when warlocks try to grief a game but it doesnt affect the actual pvp community too much.
Abyss is the main thing that needs a nerf. There's no way to make it fair without Dev's help or just banning it. Blood boil also pretty broken but with the range nerf from PTR we'll see if it is still OP. Im guessing it will be broken but not as bad.