HN: Why is GitHub's web interface not responsive yet?

Good question. You can spoof your user agent to get their separate, half-baked mobile version.

I wonder what their mobile traffic looks like. I find myself ending up on GitHub on my phone all the time, and can only barely get by without switching to the desktop mode.

Honestly, I don't know. Since MS bought them they have made many improvements, and seem to take gitlab seriously. What they lack is a decent mobile/tablet experience so I don't always have to be at a laptop/desktop.

I'm not willing to provide is trusted access to a third party when they have the full backing of one of the most well funded companies in history.

Their website is so old that it was before one was thinking, mobile-first, and now to rewrite, they don't want to spend the effort combating legacy :)