And I have noticed them too, but I rarely ever cared. In fact, most people don't care, as long as it works, and it does. Another great example is Untappd, an app with millions of users and a 4.5 star rating on iOS.
Most of Netflix apps, including the iOS version, are not native. The Android Netflix app, however, is the exception, as that is native (perhaps that's the one you've been using?).
Are you a Netflix employee, by chance? A buddy of mine works there and told me that the only non-native app is Android, but he might be mistaken since he's only been there for a few months.