Solo playing in Division 2 is fine because the gunplay is designed for you to play like a wimp. By wimp, i mean sitting in the way back, behind cover and chipping at enemies. No timers needed. Many might see that as "strategic", but any game developer undertands that playstyle just promotes a slow campy playstyle. Its passive. Added to this, enemies scale in Division 2 based on the #of players, so of course playing alone is a far easier time.