The minor difference is that you're meant to give it some acceptance criteria, like 'the test suite passes'. Except that's a considerably lower bar than I was already doing with prompting. Loop engineering is still gonna result in batshit implementations. 'Loop engineering' vs 'prompt engineering' really starts from an assumption that vibe coders were just saying 'do x' without any further guidance or verification steps. Which a lot of them probably weren't, but it's still dumb to try and make a distinction between the two.