[mym1990]

I think the drone landing where it is could be pretty catastrophic given that the drone really doesn't know what is below. Pilots routinely fly over large crowds, traffic, water, etc... and a drone with no controller just landing into one of those things is pretty dangerous. The drone doesn't necessarily need to have connection with the pilot at all times, but if it has a reference for the last point of contact, it can be helpful to guide it back to a known location.

Touche on the computer vision point!