The vibe coder doesn't know what they don't know, so they rely on the LLM to make decisions.

The Software Engineer will know what decision to make even without looking at the code.

Yes - the idea of "not knowing what you don't know" is, in my opinion, one of the most important concepts missing from modern programmers (and probably everybody), especially in the age of LLMs. It's the concept that, personally, most occupies my mind every day, and seems to never come into the minds of many of the innumerable contractors with whom I work.