User blog comment:Kirkburn/Technical Update: July 13, 2015/@comment-203.215.119.41-20150714013959/@comment-126761-20150714144240

Indeed, mobile is a major focus at the moment - such a huge proportion of visitors are on mobile devices, we want to make sure they have a good experience.

Regarding the GitHub ideas - it's certainly an interesting thought, but I strongly suspect it would end up more confusing than useful. Unlike an app, which can have a very clear "here's what changed in this update", our web development is spread out over many different areas - some of which wouldn't be represented in GitHub. We also don't use GitHub for issue tracking - so many changes could be quite unclear. That being said, we'll definitely think on it some more.