I think imitating the UI controls isn't really a huge problem. It's the inconsistent behavior, and performance that's an issue. For instance, the tab bar contro

I think imitating the UI controls isn't really a huge problem. It's the inconsistent behavior, and performance that's an issue. For instance, the tab bar controls disappear when you scroll down a page in JQuery Mobile, as I remember. This is drastically different than how it is in native.