Multiplayer is a core feature of the sim but the “Known issues” page currently says to turn it off to avoid performance issues that occur if other users are flying aircraft or liveries you don’t have (including if you have rh Standard edition of the sim and others have the Premium Deluxe with extra Asobo aircraft!).
That’s pretty indicative of the entire piece of software at this point. Get a feature 25% or 50% of the way there and “ship it” to get PR with the social media hype masters. Then stare blankly and ignore questions in the Dev Q&As when we ask about th numerous issues. VR is the one big sim feature they have added since launch and it’s a half baked mess.