A delete all *.pyc files is a useful script to have handy, but it does occasionally reduce Python developers to superstition.
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The most common selling point I hear for Nix is having a list of all the packages you need.
On a traditional Linux distro, I just install things and forget about them. A curated, commented list would certainly be handy when I have a new system.
I'm experimenting with Atuin for searching my terminal history: https://atuin.sh/
Previously I'd just used fzf to find items, which does work nicely. Occasionally I *really* want to search "commands which were run in this directory" though, which Atuin offers.
I love how the CommonMark Spec has a test suite that's just a JSON array. It's really easy to test a library for compliance, and I've seen developers nerd-sniped into full compliance.
https://spec.commonmark.org/0.31.2/spec.json