It would be extremely useful for touchscreen users as well, a scrollbar lets you scroll a whole document (and go near specific points) in an instant instead of

It would be extremely useful for touchscreen users as well, a scrollbar lets you scroll a whole document (and go near specific points) in an instant instead of swiping like an idiot for a minute. And for trackpad and scrollwheel users it's the same, I absolutely adore chiral scrolling but you still need to use the scrollbars sometimes (or often). All these things only replace the arrows of scrollbars (enhancing them with some speed control), but the arrows are just a tiny and stupid aspect of scrollbars (I don't remember ever seeing someone using them).