Based on the image of the system in use, it’s for transporting bulky (but light!) objects in areas that have lots of stairs (or presumably, in possible future applications, uneven terrain). I suppose if you can boost the power sufficiently, you could transport bulky and heavy objects across uneven terrain as well, at which point it actually becomes useful, as it has use cases that aren’t better served by just carrying the stuff (in e.g. a backpack of some sort).
Stairs.
