Hard to tell who is replying to whom.
That only works if you decide to play the way it should, otherwise I don't think other players would use another gun when they already have something effective. I myself im partial to the bolt action rifle or the DMR which I can hook up with the engineer class to take down vehicles while snipe enemies from the back lines. Not saying every player will exploit it but it does make it more difficult to keep balance on a game where you should rely on your squad to make up for what you are missing. this pushes the game to solo play as you can be a one man army
2042 example: noone likes a camping sniper that never runs out of bullets which i have done. Its fine if 1 snipes and another player ressuplies as your squad invest 2 players to sit back and support while the remaining 2 push foward (balance). As a sniper I don't have issues with this exploit but thats not how a team based game should work, there has to be pros & cons to every action performed which is lost when you allowed open weapons.
(Personal taste) I would be fine with sniper, shotgun/assault, and LMG being closed with , SMG, carbines, and DMR being open. This would be a good way to appeal to both sides but this only works if they can balance weapons. Biggest issues for me is no bullet drop, and LMG lack of suppression as i can pick their heads quite easily even if I allow myself to get shot (depends on distance and enemies aim). Most players will always try to have and edge over others specially those that are obssed with K/D ratio