A possible heuristic: Everywhere the LLM made a design decision is probably a place to revisit later. You can ship it now, but to stay in the game you need to stay in the loop.

If you need the LLM to explain to you the concept behind something - or even if you figure out yourself what it did - that's likely wrong and will lead to the undesirable outcomes you've mentioned.

As long as it just types and doesn't think otoh, you should be good. There is - I'd argue - little to no value in manually typing if (foo) {}. And it's also great for bouncing ideas around.