"Most images in the world" is not the same as "most image I shoot and select for processing and displaying or printing".
Fair enough. But if you’re downsampling to a few MP anyway (as I stated, 4K is only ~8 MP), then more MP don’t make a significant difference.
Apples don't trump oranges. Until you prove that technical quality somehow affects and reduces artistic quality, that's a moot point.
You seem to have missed the point. An image shot on a Phase One 150 MP camera at base ISO with a Rodenstock HR lens can still have crappy composition – technical excellence, poor quality. Award-winning images have been shot on older iPhones – excellent quality, technically weak.
Put another way, you can have a high quality image with good artistic and poor technical quality, but you can’t have a high quality image with poor artistic and good technical quality. Granted, it’s subjective…maybe you personally love looking at ISO 12233 charts or something like that.
With or without diffraction, more pixels means more information and better resolution.
Not true. It really depends on the optical system. For example, on one of my Zeiss research scopes with a 100x 1.4 NA oil objective, a VGA camera (0.3 MP) is sufficient to capture all of the available spatial resolution. You can put a 12 or a 60 MP camera on the system, but with that objective more pixels does not mean better resolution.
In the case of ILCs, more MP generally means more resolution, but as I stated it’s a diminishing return. Going from 45 to 60 MP is a 33% increase in MP count, but with some lens/aperture combinations that means a 1-2% increase in resolution. Technically, that’s ‘more’ but practically it’s completely meaningless.