> Ok so a lot of folks have fine motor control problems. The scrollbar is not there so you can use it to change your scroll position. It's there solely for the purpose of visualizing what your current scroll position is. Every device and every application should have a way to scroll that does not rely on the assumption that people will hunt out some narrow area of their screen and hold it while dragging to scroll. Th…
You're right that clicking and dragging the indicator part of the scroll bar to scroll around is silly and nobody really ever did it. But the scroll bar isn't just for visualization and it was commonly used to jump around the page - you'd click in the "negative space" on the scroll bar, which would then scroll the page to that position.
Though I find it's more common for a negative space click to just move a page and not jump to the location, so maybe that's influenced me.