iPad versions of apps aren't simply about scaling the UI. Take Twitter on Android tablets[0] for example, it's clear that merely enlarging the UI elements doesn't automatically result in an awesome UI on tablets.
Similarly, an UI design that works great on a phone (like with gestures from the side) might feel awkward on tablets.
Similarly, an UI design that works great on a phone (like with gestures from the side) might feel awkward on tablets.
[0]: http://www4.pcmag.com/media/images/285099-twitter-for-androi...