I was wondering what the answer would be, because it's a hard problem. There was only the half answer of "they have experience". The best answer I heard is tha

I was wondering what the answer would be, because it's a hard problem. There was only the half answer of "they have experience". The best answer I heard is that only domain experts have a chance to recognize each other. Other than that you are left with secondary signals like other people paying them for their expertise.