To my mind, iOS security is where it needs to be for that device. I respect your opinion, but we're not going to agree on that. I've considered your argument and I don't see anything that changes the fundamental "so don't buy an iOS device, they do not have a monopoly and there are other fish in the sea". For my part, I'll keep buying them because I follow a similar philosophy that security changes are preeminent and should be allowed to break and constrain other software.
Thing is, if I believed the Mac was going to be ratcheted down to iOS levels of paternalistic control, I would be upset too. My conclusion is it'll never happen. I don't think they'll ever break their general purpose computer. If they did, you'd see a massive exodus of former Mac users looking for a new UNIX desktop. Maybe a big enough exodus to finally make The Year of the UNIX desktop happen. :)
The problem is this: what part of the process I described has anything to do with security? As far as I can tell, nothing. Apple's review process is pretty superficial and is entirely geared towards stuff like making sure nobody ships a browser that doesn't use WebKit, or an app that posts information about drone strikes. Getting something malicious past the gatekeepers is completely trivial. It's building the malicious stuff in the first place that's the hard part.
Thing is, if I believed the Mac was going to be ratcheted down to iOS levels of paternalistic control, I would be upset too. My conclusion is it'll never happen. I don't think they'll ever break their general purpose computer. If they did, you'd see a massive exodus of former Mac users looking for a new UNIX desktop. Maybe a big enough exodus to finally make The Year of the UNIX desktop happen. :)