And this is exactly the sort of principle that helps to distinguish between the mechanical aspects of quantum physics, and the much-hyped angular momentum spin

And this is exactly the sort of principle that helps to distinguish between the mechanical aspects of quantum physics, and the much-hyped angular momentum spin uncertainty aspects. People make so much hay about the curious non-locality and uncertainty of spin, and tend to get tunnel vision about how nothing makes sense anymore, leaving out the broader strokes which have pretty reasonable underlying principles.