As an iOS user, it's still jarring as hell to have a native app feel like something from other OS. I don't want to learn another platform's conventions to use my own platform.
On Android it makes sense, they make android. On the web it's OK because websites all look different. But all iOS apps generally work the same and when you stand out it's annoying.
You know all those people who complain about Java applications not feeling right? Yeah, same kind of thing. As a long time Mac user you can tell when the program you're using is a lazy port from Windows because it doesn't fit in.