>a blind assumption that something that has become a part of your workflow is a necessary part of every OS just seems arrogant to me

Like no copy and paste in iOS? Apple has a history of not adding features just because no matter how useful they would be and no matter how much it is holding back its users. That is arrogant, not the user asking for features that is standard for most.

> the OS thinking that one of its several interfaces is the "primary" one that you have to plug into first, and it won't even consider outputting on another interface without being explicitly told to.

This is just wrong. Windows since at least windows xp shows something on all screens as default. You sound like a Mac user who doesn't know Windows. FYI I use Linux primarily so unlike you I'm not biased (I think both has it uses but both also suck).