Propellant-less propulsion within the confines of Earth's magnetic field or gravity well is still pretty valuable. The entire space economy at the moment is Earth satellites, all of which are constrained by propellant.
Being able to build boxes that are bigger on the inside than on the outside would also be very valuable - like a standard 40ft shipping container that fits in your pocket.
And that's very close to the kind of thing we're talking about here.
And that's very close to the kind of thing we're talking about here.