I imagine a good use case could be for search and rescue in rough/inaccessible terrain. Imagine a building has collapsed trapping people inside. A flight-capable vehicle could quickly navigate to the area, and once it reaches the rubble, it can crawl in, searching for survivors.

> I've fallen and I can't get up!

How many of us are old enough to get that?

Consider the end point of a mission; getting there is more important perhaps than getting back, especially for a drone. If everything work out, they can be retrieved manually later.

Or perhaps they just need to find a cliff.