Super awesome as long as your kids never go anywhere they could access a non-locked-down device. And assuming that device parental controls work, which (at least on iOS) they don't [1].
1. https://www.macworld.com/article/2305919/apple-parental-cont...
You can’t patch every hole. Kids will always find a way.
More technological solutions to social problems.
Same applies to alcohol at a friend's house, cigarette's behind the shop, and any other sort of restrictions when away from parents. Ultimately kid's will either take to heart their parent's guidnace or they won't.