The AI are constantly walking in front of me and other players. I think its time this issue went away (as its been a problem since before ArmA 3).
I think AI should have an extra step in their pathfinding that causes them to be aware of another friendly soldier's line of fire and they attempt to go behind them IF POSSIBLE. It would only need to be that way when within roughly 15 or 20 meters of eachother I think.
ALSO: Devs I think it could be cool if this rule only applies to soldiers that have their weapon raised. This way if you're not in combat and you lower your weapon, the new rule does not apply and AI can walk in front of you if they want. Basically meaning line of fire is only detected on soldiers with a raised weapon. (Just an idea for the devs, but it isn't as important as just getting the basic line of fire detection done)