>Seems logical to keep the paired authentication device on the main body This is actually a great point, and one that I hadn't thought of. AFAIK, the touch id

>Seems logical to keep the paired authentication device on the main body This is actually a great point, and one that I hadn't thought of. AFAIK, the touch id sensor is part of the secure enclave hardware. Connecting it to a physically "external", peripheral that is connected by wires might introduce some security concerns. At any rate, one has to laugh at Apple's public explanation. >As an anecdote: people like me use a laptop in a multi-display setup Same here, but we are extreme edge cases in that regard. And at any rate, I'd expect them to have fingerprint sensors as well, just like other high-end laptops.