It 100% intends you to play with others. It is not meant to be played single player, it just can be if you insist. You will not get the same experience.
That being said, I've played a ton on PC with no mic, just using the in game target and item marking system and a couple text messages occasionally, without any issue. Playing with randoms isn't a big issue most of the time.
Just don't take it too seriously. Half of the fun to be honest is not noticing someone threw a stratagem for a 500kg bomb into that crater you're jumping into kill the bugs and dying to a massive explosion. The game tells you everything a player calls something in and there's a light from God showing you where it's going, but sometimes you just miss it. Or the guy was prepping to throw it and died so they dropped it at their feet.
Just don't take anything too seriously. It's not that kind of game.