I was not writing Objective-C code for any of those on mobile platforms, which is the topic at hand. EDIT: though in rereading your original comment, it's a fa

I was not writing Objective-C code for any of those on mobile platforms, which is the topic at hand. EDIT: though in rereading your original comment, it's a fair question. Yes, I was around. No, I still don't think it applies. Even considering desktop, IMO Apple made great efforts to make such transitions at least somewhat seamless. In more than one instance, Microsoft's mobile message was: "that app won't run on the new OS without a lot of work."