If you forget your phone in your car, then you need a built in headset for your car so the phone can stay in your pocket.
Why would a watch know where your kids are? in order for that to work each child would need to be tagged like an animal. Also if you can't track kids at a playground please stop breeding. It isn't that difficult, I watch my nieces on a regular basis at the playground, and they tag team to make certain they can get away with stuff.
The mic on your watch won't give you better audio than pulling your phone out of your pocket.
remote camera control that is a decent idea. except that the display is tiny, won't show everything, and you have to be looking at your watch to press the button unless they use the whole screen for the take a picture button.
I always consider that things are beyond what I can dream about. In the last 30 years watches have faded away for many. Now they are as much jewelry as practical. You can't have a good looking smart watch. even the few that let you replace the bands with something more comfortable than stiff plastic are bulky. Now give me smart watch that is about as wide as my thumb, that shows me the time all the time. have it use a micro projector to push the image on to my forearm, and a laser projector to pick up where I am touching. That will take off.