If you thoroughly understand a subject, you can perceive subtle differences between close arguments. You can understand where knowledge is solid enough to be us

If you thoroughly understand a subject, you can perceive subtle differences between close arguments. You can understand where knowledge is solid enough to be used in distinction, and where it is not, and therefore conjecture and opinion are appropriate. If you don’t thoroughly understand a subject, then you don’t perceive these subtle differences, many arguments look equally valid, and the complaints of experts seem like pointless gate keeping to you.