Thanks to
@GreenHokie for all the info. I've always wanted an app on my watch to unlock my Tesla via Bluetooth, as opposed to cellular. Allows me to use it in the backcountry where cell coverage is unreliable.
I always thought the watch problem is that the phone uses Bluetooth Low Energy, that's how they can have it on all the time, to allow you to walk up to your car and unlock immediately; while the watch does not have BT low energy functionality.
So, it sounds like the app developers have gotten around this by not worrying about walk-up capability, because you have to open the app to enable BT, so it's more of an emergency backup function. That's also why it won't proximity lock as you walk away, since again BT has to be operating. For the phone with BT low energy, it's always on. Regular BT is not. And, you don't want regular BT on, all the time on your watch since it would run down your battery.
The weird thing for me, is I finally got a RFID chip an antenna in a watchband for my Watch, just a week ago. It's just like those Cnick rings. It functions like a Tesla keycard. So, now my Watch has three ways to open the car, via the RFID in the strap, via app over BT, and via app over cellular.
I didn't really want to wear a Cnick ring, so the watch strap was perfect.
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