It's incredibly useful to know what language something is written in. First and most important, a CMS almost never does what you want out of the box, so you're

It's incredibly useful to know what language something is written in. First and most important, a CMS almost never does what you want out of the box, so you're going to have to customize/extend it in whatever programming language it's written in. Second, the language tells you a lot about the mindset, ecosystem, type of design that you're likely to encounter when reading the code or even using the product. Third, the language gives a lot of hints about the deployment environment you're likely to need. Java is going to need JVMs and people who know how to deploy and tune them. C# is going to need Windows, or someone experienced with Mono. Python/Ruby/PHP/etc. are going to need runtimes and pip/rvm/whatever. Go or C/C++ are likely to have simpler binaries, statically-compiled in the case of Go. And fourth, as has been said better in another comment, this is hacker news. We're hackers. We like our programming languages, so we care. :-) I should write a definitive blog post about this, and get it ranked on hacker news, just to defuse the "why is hacker news always saying 'in go' on story titles?" questions.