Medicine and Science are self correcting processes. That's because they are very human endeavors.
For decades, people refused to believe that there was a microbiologic cause of gastric ulcers, or that neurons can regenerate. Well, there is, and they do.
Meh, the trouble is that you wouldn't necessarily need to use that distinction in the cadaver lab because you can see the course of the nerves. No one looking at a whole brachial blexus dissection would ever mistake the suprascapular nerve for a division. The issue is more the nature of the surgery itself: small incision in a traumatized area of tissue.