Downvoted, Guns are still really loud, even with a supressor. I think it's prefect like this.

People saying this would be "OP", Arma is a realistic shooter, it never went for balanced weapons. Real-Life war doesn't have balanced weapons either, and you can shoot however you want there, so why not add that in Arma?
Especially when lying on the rescue boats as passenger, it clearly looks like you're lying like that just so you can shoot, but you cant.

I agree with this. Since the Soldiers are ALWAYS looking through the sights, even if you're in third person. They also do that in real-life. And even if they aren't, it's really easy to hit stuff, even if you're firing from your hip.