Am I misunderstanding something or couldn't this just be made an optional setting?

So users can lockdown the ability to install stuff if they want without overcoming various hurdles (maybe allow users to add customised message so if a user tries to do it a message will pop-up saying "Your Son/Daughter/whoever has said you should never disable this! Call them before doing this if someone has asked you to!").

I feel like there is so many options/info hidden from consumers about their devices that really shouldn't be. And preventing it or hiding it only really serves the companies themselves, not the end user.