Oh hey! I have a use case. 
My non-wireless-capable laser printer is upstairs in a closet. Normally when I want to print something, I carry a laptop upstairs, connect by USB to the printer, plug the printer into the electrical outlet, turn it on, and print.
This would be easier and faster with the Librem 5. It powers up more quickly than my laptops, is more handy, and can pull any document from my network via sftp.
Unfortunately, I haven’t got it to work yet. I think it’s a driver issue… or “operator headspace.”
(But this may be off-topic.)