Linux

I misread it, seems like it's just the Omarchy theming system it has integration with. My point mostly still stands though, going out of the way to support Omarchy's system is still a red flag.

For those unfamiliar, the creator of omarchy is a pretty open white supremacist and transphobe among many other things. This blog post does a pretty good job of outlining everything:

https://davidcel.is/articles/rails-needs-new-governance (He also created Ruby on Rails, hence the article title, the focus of the article is mostly on that but it gives a detailed background on DHH as well)