Agree that autolands are rare, but they are used for low visibility procedures and it's not "1 plane per runway". Almost the opposite, typically you would only

Agree that autolands are rare, but they are used for low visibility procedures and it's not "1 plane per runway". Almost the opposite, typically you would only use a limited set of runways in such conditions and severely limit the complexity of ground routing. Practically real zero-visibility almost doesn't happen. There will be some visibility just very very little. You can taxi slowly (think 10 miles per hour) following bright centerline lights in quite low visibility. But it would be very dangerous to manually control a landing rollout at 150+ miles per hour in that visibility.