None of the security and privacy arguments require a walled garden though. The real benefit is the fine grained control over what an application can do on your system. A set of fine grained controls and a a good set of defaults, or better yet the ability to subscribe to defaults as recommended by third parties. I Apple had controls much finer than those presented by Android with a set of sane defaults, and to that I could add what the EFF's recommends as defaults, we would all be better off, because Apple's best interests and my best interests are not always aligned.

I'm going to repeat that last part, because I think it's very important. Apple's best interests and my best interests are not always aligned. Why should they have ultimate control over what can and cannot be run on my phone.