Like a keyboard? In which case: How do you enter your password?
Is that a common scenario? Where you can use a (presumably) usb attached keyboard but you cannot insert your security key?
So does preventing people from plugging random USB devices into shared machines.
I imagine they either memorized their passwords, wrote them on a piece of paper, or stored them on an (air gapped from the library machine) cell phone.
Also, connecting via bluetooth defeats the purpose of air-gapping.
It's not a server I need to access often in this way. But I think these necessary-but-limited-use scenarios will be interesting should passkeys really catch on like passwords did.
I don't know how common it is, but this is the exact issue that makes passkeys a nonstarter for me.