I think if it had the capability of operating independtly would be cool. Like it could share your data plan and take calls without the phone. However from a business side this wouldn't work for Apple. But maybe if it could delay the calls from your phone which it does now, but without the phone in proximity. The SIM card would allow forwarded calls or something I don't know.
Gear S already does this. I'd like to see it come to the AW at some point.