2. Even if somehow you did make bug-free software with tests alone, even if the Rust port is perfect today owing to the years of careful human work that went into building tests as a framework to guide the AI... the future can only be downhill from here. Nobody has a mental model of the new 1m loc codebase that's never read by a human, so Bun's future is committed to 100% vibecoding. Maybe the carefully planned tests minimized the worst case scenario, but the future tests will be written by Claude too.

If, and this is a big if, it turns out that there are no major problems and Bun is better off in a year from today than it is now... then somebody can just fire up Claude and fork yt-dlp to support Bun anyways and their decision doesn't matter. In any other scenario than human code becoming completely obsolete, they are simply saving themselves a headache by getting rid of a troublesome dependency.