It only needs to be paired to an iOS device for initial setup and configuration. A watch with cellular can operate independently of the iOS device after setup and configuration.
I'm very curious where your data comes from to back up this statement. "The current level of pedestrian fatalities from motor vehicle collisions is the right level" just seems wrong to me.
I think the relationship is kinda the other way around - you'll feel like your hobby is "serious" when you stop having fun with it.