Maybe not an "unpopular opinion" or even an opinion at all.
I have this suspicious feeling of the lack of coop games and only PvP games (with the lack of PvE, PvPvE) is a psyop (or some sadistic game devs just being pure evil) to keep people away from collaborating, incentivising a "everyone is against everyone" mentality. I remember battle royale games banning you from "teaming" (players from different sides collaborating, despite them being enemies in game). No, this should NOT be a bannable playstyle, it's the purest form of a diplomacy mechanics a game can offer! It gets even worse that more and more games remove voice chats. Most games don't allow you to comunicate with the enemies. The excuse is often "toxticity" for the voice chat, and the "teaming" ruining the "intended way to play". I really hate this dev mentality and it's not sincere. They remove actual social mechanics in the games and are replacing them with superficial emojis/dances. which really makes me think their retarded reasons for removing and banning these features are very dishonest.
I know there are cases for banning teming in a BR game, but consider this: Alpha Centauri had voice chat, Civilization VI does not have voice chat, these games are games with some emphasis on diplomacy! I honestly don't play a game anymore that doesn't have coop (it's sad to play alone too...) and is incentivising you to only kill others without any options to do something else. The only game I have seen giving me some hope is Dark and Darker, unfortunately not my genre, but it does feature you to spare players and to let them go away and you can both "win". So at least there is some "hope".
I know it sounds "dumb" to care about these small features, but I don't like this psychopathic game designs when I look at the state of the world right now. I'm not advocating for "muh peace in vidya" gay shit, no I just want the option for collaboration or at least sparing players as an allowed option.
Ok, an actual unpopular opinion as a tax for my wall of text meme above: Warzone should force the player to have a mic and the proximity kill voice chat is mandatory. You already got anti-cheat and other useless bloat, so at least make something fun out of it.