Earlier quoted context omitted.
Is there a way to enable parental controls with an alternate phone unlock PIN? If so, then my comment is silly and I am silly. If not, then it stands. That's where the control belongs, so one can freely share a working PIN with one's kids, with no need to turn on a setting buried in menus (not to mention always remembering to do so).
Why would you _share_ a phone with your kids? Isn't the whole point of giving your kids a phone being able to call them or have them call you when an emergency arises?
You're at a restaurant with your kid, and they're bored because you're having adult conversations with your friends. You give them your phone and they play whatever game for a while, while you have no need for your phone because you're in a conversation.
Or, alternatively, you're sitting around the house and they want to play a game on it.