> When you rewrite a project in another language, it's for engineers to be able to maintain and further develop the project better

I don't think that is the case here. Bun is pretty much using AI to write all of it's code, with a human reviewing it. Zig exists as a language to provide a nice DX over C and Rust, not to be memory safe. If you are using an LLM to generate code, the DX benefits are removed and so then why would you ever choose Zig over Rust?