I've experienced this in foxhole and I suspect it's mostly because it's a game that's designed to make you loose if you literally do not cooperate with other players, whether spontaneously or coordinated. Like sure, you can get all the shit you need to make your own artillery piece and shells, try and construct your own defensive line, then try and shell the enemy at some position or another all by yourself. But the moment enough people on the other side give enough of a shit, they're gonna roflstomp you, shell barrage the shit out of your position, and break your defenses like driving a tank through wet paper.

I even got my own story about Fort Alaska that I made many wars ago and I couldn't have held it alone lmao.