Today, sure, using a van would be much more efficient. But this is probably a way to test and improve the technology, working towards making it more efficient than a van.

More importantly, the optics here are not just about you and me and other adults. Think about it how it looks to a kid. You can have your library books show up in a van, and that might be fun, but if you could have a drone drop off your library books? What kid wouldn't sit around outside all day waiting for their books to arrive?