+1 if you are vibe coding projects from scratch. if the architecture you specify doesn't make sense, the llm will start struggling, the only way out of their misery is mocking tests. the good thing is that a complete rewrite with proper architecture and lessons learned is now totally affordable.

I think the best thing about LLMs is how incredibly easy they make it to build one to throw away.

I've definitely built the same thing a few times, getting incrementally better designs each time.