An example I had last night: how do you split a pdf into separate pages on the command line, and how do you put them back together again (I replaced one of the pages with a scanned signed version).
This is a basic task, a beginner's task in the world of pdf munging, but I didn't know the answer off the top of my head. ChatGPT gave me command lines straight away.
That's what they're good for right now. Beginner / common tasks in areas you're not familiar with.
And a further implication, they're great for one man bands, generalist roles where simple things need to be done in lots of different areas. For specialist deep roles where you have all the tacit knowledge in mind already, not nearly as useful.