Cookware has an established practical and has been with us in various forms for thousands of years so I think that's a poor analogy.

The pebble demands your attention. That is all. It does nothing that something else doesn't do already, costs a chunk of money, needs constant feeding and attention. At least a smartphone was a consolidation of communication and entertainment devices. This is a portable distraction. A poor one at that.

Do you think it's healthy to constantly stare at your heat rate, glucose level and blood pressure and micromanage every parameter of your life?

Also in a decade, you will pay a subscription fee for that data from the central provider that your watch talks to. That model is established already plus it will probably be linked to your health insurance profile as well by then. You'll wear one to keep your premium down...