Yes, but the entire point is, you can't have a reasonable chain of command or any kind of sensible decision process without human judgement that has engineering expertise, so no, engineers are not going to be entirely replaced.

The reason human judgement is necessary is not because it's "better". It's because the entire reason the business exists is to execute the human's judgement. There is no "right or wrong" way to build a startup if different paths are all profitable, but the human decides what they want to do.

Could Bun have survived and done well even if they didn't rewrite the codebase in Rust? Yes, it would've been fine. But the human decided they wanted Rust, that's a different path they chose with different tradeoffs. The AI has no skin in the game , no ownership, it doesn't belong to the AI. The AI only exists to serve the human. And if the human wants to make good decisions, inevitably they need engineering expertise (or an engineer) to weigh the decision.