Show them the money. Those features are undeveloped because they aren't valued enough. If more people wanted and used them, they'd develop them better.

Here's my favorite quote from the comments: "Simple solution, don't let your kids get their grubby paws on your phone. I have none of these issues as my kids are not allowed to touch my phone. They have their own electronic toys and iDevices to play with."

Yes, that's right, the best way to prevent kids from destroying expensive things is to not hand them to them. There are devices designed for children that have these protections and more.