In your fourth paragraph you refer to digital quantization, which I imagine is you referring to the idea of digital "stair steps" in the wave form's sampling.

In your fourth paragraph you refer to digital quantization, which I imagine is you referring to the idea of digital "stair steps" in the wave form's sampling. In reality that's not a thing that actually happens. This stair step visualization is an abstraction that is used to illustrate sampling theorem. The reality is that digital wave forms replicate as perfectly smooth waves when they are converted back to an analog signal, as demonstrated here: https://xiph.org/video/vid2.shtml https://xiph.org/video/vid2.shtml That said, I agree with all of your other points.