I know you can grenade your friend in co-op. Adding friendly fire kinda add more realism to the game. I was playing with no HUD markers. Kinda fire everything that move right. If there was a friendly fire in the game , we would have to check fire each time we shoot. I think that will be more immersive experience and should satisfy most of realism guys out there. About toxicity..... you can maybe have a setting in the co-op lobby to enable friendly fire on certain co-op lobby. So you won't be shot by your toxic teammate ( As long as you are the lobby leader ). Btw, enjoying the new updates. Really love how you can manage things about gear level. Keep up the good work m'lord.