Joe can walk into an Apple store (or wherever they purchased the device) and ask them to enable parental controls on it. We have people whose job it is to service computers and phones, they have been around for more than half a century. I am pretty sure most Joes don't service their cars either, yet they keep them road legal by visiting trained mechanics.

As long as Joe has the right to vote, which is something more important and more complex, we cannot complain that parental control is too complex.