I have never seen this kind of physics taught as THE TRUTH. Almost everything is an approximation, and there are almost always higher order terms smearing thing

I have never seen this kind of physics taught as THE TRUTH. Almost everything is an approximation, and there are almost always higher order terms smearing things around in a lab setting. This is part of why physics is taught with a lab component, to help build intuition for handling uncertainty and its sources. The SG experiment is a great intro topic for an undergrad quantum class because the essence of it, that you measure two clusters, cannot be explained with classical mechanics. Complicating that headline further is pedagogicaly counterproductive. There is no grand conspiracy to deceive students.