[jawaddeo]

(Disclaimer: I'm part of the Texpad team.)

I agree that a lot more needs to be understood and imagined about how we may use the touch devices, but radical changes don't have to be radical on day one. Indeed, from experience radical changes fail precisely because users can only absorb so much change in one go.

As it turns out when you take the touch interface into account as our iOS 7 app does, you can do some sweet things. My personal take is that you experiment with the interface _while_ making sure you don't break the existing ways of inputting (= generating content). If you shove a lot of change down people's throats in one big spoonful, you alienate them. Evolving the UI means you can take user feedback and adjust the course on the way. Radical changes mean you assume you know exactly what they want and need (and you don't mind breaking their workflow to impose the new way). That's a big assumption and may appear a little presumptuous to users who've developed a workflow around your app.

We may not get it right completely in one go, but we can assure our users that the app is the product of their feedback and will continue to be.