Regarding the blog post: Xonsh now has 125 contributors on GH, is tested by Travis, Circle & Appveyor, and is analysed by Lanscape (https://landscape.io/github/xonsh/xonsh/2936). I see the Landscape score is not that great, but also that lots of the errors reported are false positive.

So IMHO there are some serious QA efforts going on on Xonsh, and the concerns reported by the blog post you are citing are probably past history.