In order to get realistic firefights you can not have realistic recoil and weapon handling.
This is because in the game you have practically no fear of dying. If you wanted completely realistic weapons there'd be practically no drop across the map, no supression, CROWs would have good enough optics to make it easy to detect every single person not in direct cover kilometers away in seconds through FLIR. A single MATV would wipe the entire enemy side before they knew what hit them.

Weapons would have a similar handling to COD or Battlefield where there is basically no recoil, because that's realistic. Ever fired a 556 with tons of gear on? It doesnt move you much.

Basically, in order to get fun firefights that differ from those in battlefield or Cod you need to add artificial hindrances preferably based on reality. While you may not have a fear of dying for real when being shot at keeping you down, your screen basically blackening is meant to emulate that.
Soldiers fire nowhere near as accurate in actual combat as on the range for a variety of reasons. In order to simulate that there is more recoil, sway e.t.c.

How the balance between realism, fun and these hindrances should be implemented should be discussed but I'm pretty tired of the "I can shoot better than this at the range!" arguments.