Where does “it used to work, but now it doesn’t, and I don’t understand how it could ever have worked” fit in?

Damn now you made me want to learn COBOL just for the meme…

Same, but I guess if you have a idea you want to build then using a language you are already comfortable with makes it a lot smoother than learning one that could be a better fit.

Maybe this? https://www.quora.com/Whats-the-logic-behind-Google-rejecting-Max-Howell-the-author-of-Homebrew-for-not-being-able-to-invert-a-binary-tree (his own version of what happened)

But you should probably touch it before all the dependencies are outdated. And before everyone who understands how to work with it has left. Especially if it happens to be core to the business.

:)