that comes down to map design and a little bit of weapon balance, not class balance.
The vector is already getting a nerf, as are SMGs in general. We can expect to see a change in aim punch as well which will help a ton with weapon variety/balance.
Map design is something else, the spawns are static and many players simply refuse to leave the blue zone, which naturally ends in spawn camping, since that forms a firing line by the winning team. This is very noticeable on maps like construction domination.
If too many players sit in blue zone camping, the enemy team sets on up the buildings across the street, and it becomes impossible to root them out, in part because the losing team doesn't have enough playesr leaving the blue zone to even try.
Class balance is just that other classes can't reset themselves. That'll give a ton more variety.







