In response to ChrisJ4203, sberman and many other,
I do respect and dearly appreciate your point of view. I was even thinking the same way as you do. Until I recently found a dear friend deeply in trouble just because his wife sneaked into his phone and create havoc with what she found. And, this is not the only risk!
Let me remind you that iPhone is a smart phone, even more, The Smart Phone everybody try to imitate or more. As a smart phone, its utility will depend on the user. We all own one but we don't use it the same way. Useless for me to go into details. And, still, we are proud to show/share it with others.
Most of us merely use it more than ten percent of its capability.
On all of them iPhone, there is a button (icon) called SETTING. The setting we will adopt will depend on the options available, the knowledge of each owner and his tastes. The fact that I am not knowing/understanding/using (or else) a particular setting isn't a justified reason to prevent another customer from having it!
For the high price we paid to acquire it, I am convinced that some more "restriction mechanisms" are some of the capabilities Apple's research and development should add. Make them available to everybody without imposing them to anybody!!!! Each user would decide what to do with it. Many users don't even lock their smart phone.
Friendly, proud iPhone user!