Having separate tools active for finger actions and pen actions would save on manual tool switching, thus saving time and unnecessary effort. In my personal case I’d like to able to have a separate tool for my Apple Pen (Pen tool for note taking), then instantly being able to highlight a line just by using my finger, without the effort of manually switching tools. Furthermore, using the finger to select and drag, or place a sticker or image. I know that you can switch between tools with double tapping the Apple Pen, but that is generally reserved for erasing, this would expand beyond simply having two tools in quick access.