Remarkable history of building radios during the second world war in prisoner of war camps. Very few premade components and all schematics were from memory!
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It feels like a mature software project is one where bugs require multiple commits to fix.
You've hammered out the basic issues, so the remaining issues are often weird interactions between components.
OSS components are so common in software stacks now. It might be an interesting exercise to try to build a e.g. a web service with 100% proprietary components.
@louis@emacs.ch Low level stuff needs a language without a GC (C/C++/Rust) and Android has been Java based throughout its history. I don't think they have much choice without rebuilding major components.