Is diffraction an increasing worry? Or, what's wrong with more megapixels?

Macx wrote:

Well, getting the exposure and focus right is physics as well. We can allow the camera to do all the calculations for us, but understanding what they are can be helpful. Framing and perspective is physics for that matter too, even if we have a much more intuitive understanding of these things.

Since you don't worry about those things, you may have missed my point, though. My argument was that it's the final image that is the interesting bit, and that we aren't as limited by diffraction as is usually postulate, simply because the practical, useful resolution of the final image mostly is much lower than what the camera sensor picks up.