> If you had no prior experience building that exact thing, writing that spec would be 95% of the work.

Nowadays most mainstream LLMs support pre-bundled prompts. GitHub Copilot even made it a major feature and tools like Visual Studio Code have integrated support for prompt files.

https://docs.github.com/en/github-models/use-github-models/s...

Also, LLMs can generate prompt files too. I recommend you set aside 10 minutes of your time to vibe-code a prompt file for PCB generation, and then try to recreate the same project as OP. You'd be surprised.

> Anyway, I don't think the experiment is wrong, but it's also not exactly vibe-PCBing!

I don't agree. Vibecoding doesn't exactly mean naive approaches to implementations. It just means you enter higher level inputs to generate whatever you're creating.