> we're supposed to all be refactoring code to avoid duplication, using third party libraries to avoid duplication of effort, writing code that's dense enough that it can be understood and consulted without putting too much load on short-term memory but spread out enough that new maintainers can reason about it.

idk about you but 3rd party libraries are quite often a tech debt liability as they're full of so much extra crap you don't need. If you can, you're better off just pulling the pieces you need directly into your own project and forgetting about the rest unless it's something Really Important^TM like a TLS stack