There’s a couple of implementation issues that I see as great challenges, and I forsee user experience research maybe being re-written and re-defined as a result. We currently know that horizontal scrolling is a big ‘no’ in the world of traditional desktop and mouse users. However, horizontal scrolling on touch devices is not an issue due to different motions, less strain and the way we hold the device. However, our first consideration are those devices that now double up as both. Windows Surface is a great example of a device that can be touched or operated via mouse, so how do we approach horizontal scrolling?
The second is the vast resolutions we now consider from a technical aspect. I fully agree that a fixed grid should be avoided and we should be suggesting horizontal interaction by the peek of the last list item, however, as we don’t know the horizontal resolution of every possibility, the implentation cost is quite high, and success rate quite low.
These are challenges that really excite me and the more our user devices advance, the greater and more exciting our UI challenge becomes.