The resolution is low, and there is nothing to do about it. You caan tell it's not important and you can tell that it saves battery. But if resolution is not important, why would UI be so much important about OS?
As you put it as one of the strong sides. From my exp with Z10, Good screen make logic UI fantastic. It's like watching good movie in Telescreen quality. And about battery — really that the reason?
They don't seem to have apps and provide only android apps.
So two strong cards are TOH and UI and no one knows exactly anything about them.