Comment by tovej

You say the threshold is not entirely subjective, but then you describe a subjective (you just know it) and ambiguous (transitioning back toward engineering) threshold.

Sure seems to me like it's subjective.

Also, I've nedlver ever heard so much talk about "verifying architecture" as when people talk about vibe coding.

That's not something you usually do. The architecture is the overall structure of a design, and has to be elaborated into functional designs and interface contracts before you have something you can verify in actual code. The architecture itself is very much an intangible thing. "Verifying architecture" in diffs is nonsense, and is definitely not engineering.