My most obvious use case for something like this would be sports. If I can interface with my phone, it'd be much easier to mess around with something on my wris

My most obvious use case for something like this would be sports. If I can interface with my phone, it'd be much easier to mess around with something on my wrist, than something in my pocket, when snowboarding. I keep my phone in a waterproof pouch in my inner pocket when going down the mountain, and it's a pain to get out. This'd be much easier.