While LLMs and people are questionable in their ability for one-shot answers to complex things, with an LLM you can at least ask questions ad-nauseum all the way down the tree, ask for sources, ask it to be self-critical, think step-by-step, etc. From there, you'll at least be armed with more knowledge to ask better questions, whether to an LLM or a person. I think it's also a good exercise in figuring out how to break complex things down into smaller parts, and figuring out what questions to ask -- especially important if it's something where you barely know where to start.

Humans have a tendency to over-value their personal experience and cite their limited knowledge sets, beliefs, and intuitions as fact, and will probably tend to only show you the info that aligns with that.

I guess I'm biased, but for the most part, I don't think the error rates between people and LLMs are significant enough for me to want to deal with the human ego, versus an AI with infinite patience. There are certainly equally intelligent and gracious people, but I don't think they hang out much on Stack Exchange (or much of the popular internet, really)