You can take multiple vehicles but you dont have to as you can infinitely respawn in the same vehicle. With how poor the PvE gameplay is within ASB, the need for more specialised alternative aircraft within a “line-up” is pretty minimal.
So if you only take a fighter for example, with no ground attack. It doesnt matter, so long as the lobby isnt dead.
Yeah, it can, though at a few BRs, like say 9.3 with the Buc S2 or 10.0 with the Jaguar Gr1. I wouldnt bother with any of the fighter options and just run a single vehicle.
I have fighters as back-up for BRs like 11.7 with the Gr1 (but I dont really like playing the FGR2) or I have the F3 with the GR4 at 12.7 (but it struggles in the uptier)
Typically, if im in the mood for a mud mover. I play the mud mover, regardless of the opposition. If anything that makes it more fun by making it more challenging.
You still might want to pick another fighter for the current situation because it might have better radar/missiles/etc, while lacking in other areas you deem aren’t that important for the current matchm