> This is a chicken and egg problem I find hard to resolve with LLMs. If we're pushed to delegate most work to them, how do you build that expertise?

Learning from LLM written code is significantly and meaningfully different from struggling on your own or learning from more experienced human co-contributors. Especially in a large, complex, iteratively developed codebase.

Worse, once you're in that situation you are now at the juxtaposition of: "I did this. I understand what my reasoning was, and now I know why it is wrong and how to fix it" vs. "An LLM did this, I don't know why it did this, I'm not sure what it was trying to do or what pattern it followed and I'm not sure how to make it better because I didn't write or understand the original implementation either"

Is it impossible to learn and gain experience this way? Not at all. But it's definitely not equivalent.