Depends on how serious you take it, team based shooters can be that.

I played “Nuclear Dawn” and “Natural Selection 2”, but they’re a bit old now. But games like “Arma” should work too. I didn’t play “Angels Fall First” but I did have my eye on it for a while.

I guess someone will recommend the milsim shooters like Squad, Squad 44, Arma (Reforger) though I fear it’s not as deep or organic (i.e. you need to be in a clan).

Well yeah, most of the time, randoms won’t appreciate the depth the game can offer and will ruin the experience. If you want “deep but organic”, that’s impossible because “organic” people will not go deep enough.