Re: I'd be annoyed if the walled garden is opened up.
Obvious counter: if there's a way to break the walled garden, social engineering will come up with ways to make Dave turn it off in the name of "enhanced security". So Apple doesn't provide such an option with iOS: no way to turn off something that has no switch, their thinking goes.
Which leaves a no-win situation: too tight and you tick off power users who complain; too lax and Daves get their devices pwned and complain, and the medium is probably UNhappy as you end up with complaints from BOTH of them at the same time.