Children shouldn't drive cars, they shouldn't do drugs and they shouldn't use smartphones.
Would you be fine with a beer company making a "safe" version of beer for kids so they get hooked and once they turn 21 they switch to the real stuff and become alcoholics?
Making these devices more "child friendly" is the wrong solution to the problem. Actually, it's the absolute BEST solution if you are Apple and want to calm the parents down and sell more phones and services at the same time. Unfortunately I'm not Apple and my objective regarding my kids is not to maximize profits and push complex technology to people down to the last semi-conscious toddler