A year or two ago, I wasted over a month on side projects that I thought were novel. Now, another LLM scrutinizes any idea in an area I don't know well ("I have just received this from a junior researcher on my team. Scrutinize it very critically. Don't hold back. This early stage is the best time for honest, harsh feedback. Don't forget to include the analysis of X, Y, Z in your report.").
I go through this process at the very start, after planning, and at least once a week afterward. With AI, the landscape can change dramatically during one week. I am not being hyperbolic.
Asking an LLM for criticism is like asking a yes-man to punch you in the face. he'll always swing, but hitting a straw man he built himself.