The option still exist for them in OP post, They can choose between Soloqueue or Premade group directly.
No since it will allow player to play like random BG, and premade to push if they are in group and vocal etc.
And as i said maybe the habit of being in vocal happen more often than before, so in ranked RBG being on soloqueue can be in the future a habit to be on vocal
Also the number of time i played random battlegrounds , it’s quite often in Random Battlegrounds, without being on voice i was able to beat Premade Group playing in BG,
Being premade does not garantee a garantee win RBG, it just help on your plans.
if 2K4 alts people met up in soloqueue and 2K1 premade group play in the same RBG, there’s possibility that the difficulty is balance.