I have to say, the Tower..and a working ATC ground radar is a huge miss in Multiplayer with friends. Yeah, I know the old Vatsim thing..not my idea of fun I'm afraid.
It was great having a buddy as ATC..and a few friends flying in the virtual skies...I have to say, Multiplayer in MSFS is a major dissapointment.
Really hope a third Party developer like FranceVFR decides to make one.