There are lots of ways to have a fully functional brain besides writing code manually…
I suspect that a lot of people who are going full hog on LLMs aren't actually making up the difference, and are simply offloading their thinking. I choose to not be one of those. I'll use them at work because they make me faster and most of the code is already not mine. It's a means to an end. My personal projects are for the fun and love of programming, not just to have some software in the end.