Wacom Computers, MS Surface, and I'm super several others can use windows auto rotation feature. Photoshop works fine with it, but Adobe Illustrator (even in touch workspace) just doesn't want to rotate the UI to portrait mode for some reason.
It wouldn't be that horrible, or there was at least a manual button to rotate the user interface... But even that doesn't exist.
Please, please, please add UI auto rotation to Adobe Illustrator.