Comment by ProCynic

A lot of the really popular shooters out there now are collaborative, or have a strong collaborative element. For example, Destiny 2 can be solo, but really encourages you to group up with a couple friends to run 3 person strikes and other activities. Overwatch is a 6v6 game that is unwinnable without teamwork, and similarly R6 Siege requires advanced team collaboration. PUBG (2.2 million current active players at this minute) and Fortnite both derive a large part of their appeal from their very popular duo and 4 person squad modes. If you look at what people are actually playing right now, a huge chunk of it is largely collaborative games.