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Dragging with the scrollbar is far more accurate if you know where on the page you're headed (of course an impossibility with infinite scrolling).

You'd be surprised.

I've done many user tests and training sessions only to inwardly wince every time the user painstakingly does that. (And this on their own hardware, with their own mouse they use every day at work.)

After you explain it, they say "wow, that's neat." And then promptly forget it and start dragging the scrollbar again.

I was until recently a devoted scroll-wheel-user. But I'm starting to see the first signs of arthritis in my fingers (far too early if you ask me) and scroll wheels are becoming increasingly uncomfortable.

I've been surprised to find that dragging an old-fashioned scroll bar is actually a faster and more accurate than the wheel if you're scrolling by more than a page or so.

It is very inconvenient on a large page like this, should you need to quickly move up/down to read a related comment. If you know it, dragging the scrollbar, on the other hand, is quick to land you in the approximate target region.