Even if it performs reasonably, it may still be unmaintainable, meaning that any future changes are likely to introduce bugs and instabilities. At the present state of AI coding it’s completely understandable not wanting to depend on code that the maintainers have no good understanding of. The code auditors would have to become the maintainers.

Yes, but only if auditing includes an exhaustive human review of the code, not just passing the tests we (or an AI) thought to write.

I'd hope that the bun team is going to put into the work to ensure the LLM translated version is up to snuff before cutting a release from it though... it doesn't seem fair to assume that that isn't going to happen.