LLM-assisted software engineering seems to be very efficient if you have a deterministic target. (bun rewrite from zig to Rust, 100% Node.js compatibility, pnpm compatibility -- https://github.com/oven-sh/bun/pull/38333)

My pushback on that would be that all of the "engineering" concering a rewrite was already done the first time around. It's a glorified translation.

I do agree that the port would've taken a lot longer without LLMs though.