[OJFord]

> Now: I take my phone out. I need the FIDO key to unlock it, so I get that out too, I unlock the phone, I look at something on the phone, and then I get distracted and this time leave both the FIDO key and the phone in the same exact place, because of course I do I was using them both when I was distracted.

If I had an NFC one what I imagine doing is just pulling my phone out of one pocket and tapping it against the other, where my keys are.

I suppose if I was going to plug it in I could do that today (albeit with a USB-C adapter) but I don't because, the security point you mention aside, it's a usability nightmare (even if I didn't need an adapter).