Jive supports a mobile UX; you can try it out it here: https://adobeforum.jive-mobile.com/demo/
John Cornicello could turn on this capability pretty easily. However, when it is on, users of mobile devices can no longer access the regular site. This is a problem for some people, which is why John hasn't flipped the switch.
Yes, I wouldn't want a limited mobile device-specific interface either.
Since the iPad is pretty much a fully functional Safari, I should think it should be possible to just make it work - after all I *can* type in posts - but I haven't thought through the implications of a touch screen editor interface and the full editor. Obviously things like mouse-based selections are pretty different.