After getting powerful enough, smartwatches could be full "peer" devices in your Personal Area Network, though.
Rather than tethering the watch to your phone and having the watch just being treated as another phone peripheral, you could just as well do the opposite: have the phone tether to the watch to serve as e.g. a keyboard and secondary display.
Rather than tethering the watch to your phone and having the watch just being treated as another phone peripheral, you could just as well do the opposite: have the phone tether to the watch to serve as e.g. a keyboard and secondary display.