It is nice for when you need a quick and dirty little fix that would require you to read a lot of documentation and skim through a lot of jnfo you will never need again. Like converting obsolete config file format #1 to obsolete format #2. Or to summatize documentation in general, although one needs to be careful with hallucinations. Basically, you need a solid understanding already, and can judge if something is plausible or not. Also, if you need standard boilerplate, of course.

It sucks most when you need any kind of contextual knowledge, obviously. Or need accountability. Or reliable complexity. Or something new and undocumented.