One may be able to wirelessly stream video from an external hdd and watch it on the computer and transfer large files around without having to plug in this and that to do it.
I've tried and do not like wireless mice and keyboards. Wireless mice with me have always just quit working at a random point. Nothing works to get them working again once that happens. & wireless keyboards are to brittle, with me just drop 1 and they quit working, even if they land on carpet or any surface that is soft. & changing batteries, costly and an annoyance.
Though I do look forward to having some wireless usb transfers like mp3 player to pc, and some other things like that. I may give external hdd's a try again at that point, maybe.