No, cars didn't have seat belts for a long time - generations of people drove without them. When they introduced them a lot of people complained. Now you would have to be an idiot to argue against seat belts.

"Kids" is a very broad term - I don't think tracking older teenagers is appropriate but tracking a toddler (prob too young for this) through to teens is perfectly reasonable. Many people track their partners, family, etc via Apple and Google sharing locations.

It's not that kids need less tech, it's that they need less screen time. Arguably this watch isn't screen time.