I remember this was brought up about a month or so on HN, in the context of describing how one person's experience using LLMs can be so vastly different than another person's:

"LLMs seem good at things you are not good at."

So, if you've never touched PVC before, LLM sounds plausibly competent--it may actually be or it may not be, but you'll walk away from it thinking you learned something. If you are a professional plumber and ask an LLM the same thing, the output will more look flawed and possibly dangerous.

Same for software writing: If you're not a good software developer, you probably think an LLM is great and writes much better code faster than a human developer can. But if you are a good software developer, LLM output is slop and requires huge rework to be passable.