So there are many hacker type comments below. And I somewhat agree with them. My kids use an Ubuntu box where while they are not sudoers they can do what a user can.

The tablets (android) are different. For one the age can be much younger. My 2 yr old can play with the tablet, but I don't think giving her access to settings is going to help make her into a hacker. Ability to read makes a big difference between iPad and computer.

I will also note that giving your kids access to scratch and python is far more likely to build the next generation of hackers than having access to iOS settings.