I don't think Keybase is getting a fair shake in this post. The author is using the ChromeOS Android app. This seems like a fairly unusual setup, but maybe Chromebooks are more popular than I think? Plus the low amount of memory in Chromebooks guarantees that this is probably not going to turn out well.

Most people are going to use the Electron App on either Mac, Windows, or Linux on a laptop with a decent amount of memory. Also, the part about no "GitHub integrations" is false too, because I'm looking right at githubbot that is maintained by the Keybase team. Maybe it doesn't support all the things the author is looking to do, but that is different than saying there is no GitHub integration at all.