Originally in the 1990s when there were 3-button mice without scrollwheels, especially on Sparcs and whatnot, middle clicks were good. But then mice standardis

Originally in the 1990s when there were 3-button mice without scrollwheels, especially on Sparcs and whatnot, middle clicks were good. But then mice standardised on scrollwheels and the middle button being the depression of the scrollwheel - and it's not so good anymore. It's way too easy to accidentally scroll when clicking a mouse wheel, and few people would disable the scroll wheel or get 90's type straight 3 button mouse. The middle click in windows for "scroll mode" (or something) as you say, is useless. And I can only assume that's a mode that exists precisely because people without scrollwheels still need to scroll so it emulates the wheel. Poorly.