Your cheap home PC doesn't have the physical space for another hard drive inside, so you buy an external one and your wireless keybbbbbbbbboard starts acting up when you're backing up.
Seriously, USB 3 devices put out a bunch of 2.4GHz interference and it fucks up wireless gear. Put your dongles on cheap USB extension cables and blutack them to the underside of your desk, I promise you'll stop hating Bluetooth quite so much if you do this.
Bluetooth is still shit, but this one's USB's fault.