That may be what you want it to be, but that’s not actually what it is or is intended to be. The lessons are supposed to happen at home, the horse show is the test. It’s not the judge’s job to teach exhibitors what quality means, they are only there to rank the class in front of them, which is a snapshot in time. But, if someone who wants to learn sat and watched a hunter ring for a day, and made note of what pinned, you can actually learn because you should see trends emerge. The problem often is most people don’t get to see the whole class to make a relative comparison. As mentioned above, the indoors livestreams this fall are great opportunities for people to watch and see what wins too.
Your gripe with hunters appears to be that shows are not clinics. So if that’s what you want, then you are correct that hunter shows aren’t where you are going to get what you are looking for, because that’s not what it is designed to be. No matter how much you would like it to be, it’s not, and most people don’t expect it to be.