> > What if the computer you want to log in on doesn't have Bluetooth?

> Only if they’re a bit old. Nowadays WiFi chips double as Bluetooth chips on newer platforms.

What if the computer you want to log in on doesn't have a WiFi chip?

It doesn't have to be an old computer; for instance, the desktop computer I built last year uses a wired gigabit Ethernet connection to the router right next to it, and doesn't have (or need) any WiFi or Bluetooth chip.

Only if they’re a bit old. Nowadays WiFi chips double as Bluetooth chips on newer platforms.

That's a technocratic reply, not one that is useful in the real world.

As noted by the person you're replying to, it's not his computer. It's a public library.

Most computers in non-residential settings will have various features locked down, including Bluetooth.

Hotels, clubs, airport lounges, various government facilities… there are thousands of places where you might really need to use a computer but don't control the technology.