I agree with most of this, but my one qualm is the notion that LLMs "are particularly good at generating ideas." It's fair enough that you can discard any bad ideas they generate. But by design, the recommendations will be average, bland, mainstream, and mostly devoid of nuance. I wouldn't encourage anyone to use LLMs to generate ideas if you're trying to create interesting or novel ideas.
It’s like being a smart-ass for the right reasons, without any social consequences.