@Shrigglepuss maybe doing an art looks different for some than you are imagining here.

Maybe you could ask an artist what they would use it for instead of prescribing your not getting it as the only way or perspective.

Literally different strokes for different folks.

Were this mine...

...I would avoid using something that scratches my interface for art, and have zero problems with the fact that the color bits aren't perfectly matched because nobody else has a display that perfectly matches anyway, now I have two points of visual perspective instead of one.

...I can put my palette on it, and rely on my trackball for pointer input.

...I could use it for seeing the way it looks on a tiny screen without uploading it to my phone or resizing it, helping me determine if it's worth spending extra hours getting something to look just right.

...I would use it for my to-dos, so the entire main screen could be the piece of work instead of cluttered by tiling my tertiary stuffs.

...and I would have key ccombos to swap between these modes, because I know my workflows, and although most of them are not art, the use case of something like this is broad enough to appear obvious to me.

But then, I design hardware...not everybody thinks about all six million details of physical kinesthetic stuffs.