Getting feedback from someone else is very helpful.

They will ask the question from their perspective, not yours.

It's just someone who is not on the team with you whose ego isn't tied to the current approach.

They can be more objective, view the situation from the balcony.

An LLM can view anything from the balcony.

It has all of humanities' baseline intuition, but no ego.

It can critique things without feeling attachment to them.

LLMs are average.

Which means their biases are evenly spread, not highly concentrated as any individual's must be.

LLMs can be very good at giving cheap feedback on ideas when prompted well.