I'm no expert on encryption, but this article made it sound like several of the areas that made iOS less than secure weren't bugs, but specific design choices i

I'm no expert on encryption, but this article made it sound like several of the areas that made iOS less than secure weren't bugs, but specific design choices in terms of what they allow developers to do, which often make things more vulnerable. I guess I was asking if, in a world where someone could (feasibly, if not easily) take one of the existing mobile Linux distros and modify it to make it more secure than Android or iOS, or if they're already sort of at the limit there and barring a fundamental advance in computer security across the board, this is just how things are?