I often discuss ideas with peers that I trust to be strong critical thinkers. Putting the idea through their filters of scrutiny quickly exposes vulnerabilities that I'd have to patch on the spot, sometimes revealing weaknesses resulting from bad assumptions.

I started to use LLMs in a similar fashion. It is a different experience. Where a human would deconstruct you for fun, the LLM tries to engage positively by default. Once you tell it to say it the way it is, you get the "honestly, this may fail and here's why".

To my assessment, an LLM is better than being alone in a task and that is the value proposition.