One important note that isn't mentioned here. From what I understand, major/towered airports often have crews working the ground at night (due to the low traffi

One important note that isn't mentioned here. From what I understand, major/towered airports often have crews working the ground at night (due to the low traffic), towing planes, etc, and communicating with the tower over their own frequencies. Not expecting an unmanned tower themselves, they could easily try to "wing it" as best as they could to get their job done. Sure pilots can avoid each other on the normal control frequencies, but the situation on the ground could be unexpectedly dangerous to ground crew/vehicles, especially in a night landing.