I Am Happier Writing Code By Hand

The other major part of the job is to ensure correctness. For me, it is much harder to verify the correctness of code I didn’t write compared to code I wrote. The process of writing code helps internalize the context and is easier for my brain to think deeply about it. If I outsource this to an LLM, I skip over the process of internalizing the problem domain and I can’t be certain that the generated code is correct.

Writing the code helps you understand what it's doing. The better your understanding of code, the easier it tends to be to debug it when you're trying to track down a bug or other issue.