Yes, you are so much cleverer than I. Ad hominem is ad hominem, however you try and wrap it up or disguise it. Arrogance is an ugly thing to display. Sometimes, you have to Read. The. Fucking. Manual.

The truth is that you have struggled to understand something largely due to pre-existing bias. You had learned a way to do something and expected to be able to map that to a different workflow without any learning. It really is that simple. It made you feel stupid, and you are confusing that with something being unintuitive. macOS isn't perfect, far from it, but claiming it's unintuitive because you couldn't immediately scan a document is nonsense. Scanning a document in KDE requires additional software to be installed, which is also an option for macOS, but with Preview.app, it's already there. Lack of familiarity is not the same as unintuitive. Claiming things are undocumentented when it takes 30 seconds to find official documentation on that very subject is nonsense. Moving the goalposts after being shown something is a asshole move.