More importantly, it's not the same thing at all. All the code in windows (at least until recently) was written by humans, understood by humans and reviewed by humans. And that code has stood the test of time, proven its value and stability in the wild, on billions of systems. The fact that the current maintainers haven't needed to understand or replace the code is some indication of the code's quality.

Almost none of Bun's rust code has been even seen by a human, and it's only about two weeks old.

I'm somewhat willing to accept vibe-coded code if it's either absolutely non-critical, well reviewed, or maybe in the long term if it's proven itself. But not two week old code.