There are multiple reasons, including what you mentioned. The first thing is that test codes are generally considered "safe" to write and change, so it won't be

There are multiple reasons, including what you mentioned. The first thing is that test codes are generally considered "safe" to write and change, so it won't be end of the world even if LLM does something subtly wrong. The next is that reading a test change is usually easier than writing it, which is the entire idea of golden/approval tests. And finally... people generally don't like writing tests, which is probably the biggest reason...