I see LLM usage as more of a spectrum than a binary decision. For the most critical parts of my day job, I still don't commit anything from an LLM that I haven't checked myself. My brain has never felt busier and more engaged on that stuff. But then I also produce absolute mountains of code (side projects, internal tooling) that I don't have time to review and frankly it doesn't really matter what the code looks like. You can choose how much to engage your brain. Every project is different.