Kind of what I was thinking.
Example: New shooters shouldn't be answering questions on here on subjects they know little or nothing about. That said, as you gain experience, you gain knowledge, and your opinions carry a little more weight.
You'll never get the knowledge about interpreting the insides of a barrel without actually doing it. A gunsmith who has never looked at rifling or chambering with a scope is probably just as worthless at that as I am (well, OK, almost as worthless...)
If I see something in the barrel that looks odd, I can ask my smith, and see what he says. It may be nothing, and I learn something new. Or it may be something that he somehow missed. Who knows? I agree that you shouldn't go in with an accusatory mindset, but a good smith should also be willing to explain what you found, and say why it isn't or is a problem.