There's other devices that work fine wired or over Bluetooth or a dongle like the Xbox One S controllers. Maybe Logitech thinks it would be too confusing as the

There's other devices that work fine wired or over Bluetooth or a dongle like the Xbox One S controllers. Maybe Logitech thinks it would be too confusing as the mice they make that support dongles and Bluetooth also support multiple connections so throwing wired in there might be too much. Who knows.