Cables are terrible, but we're not quiiiite to the point where we can just snap our fingers and make everything wireless. The iTwin seems like a legitimately cool stopgap between the two. You plug its two halves into two computers, and it lets you access both machines' files from either computer.
Did you ever have one of those friendship lockets, where you wore one half and your friend wore the other? iTwin is like that, but it's a USB stick, and it remotely connects your computers over the internet.