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IIRC (tho I could be making this up), scrollbars became overlay because most mice have a scroll wheel and most trackpads have gesture scrolling support. These are faster than a scroll bar, because you don't need to move your mouse to the side of the screen to use them.

Try to scroll a 1500 pages PDF with the mouse.

12 years ago with Lion

I imagine if you had the usage data, you’d see the scroll bar is clicked very infrequently.

I also infrequently need to jump to certain parts of a page compared to how often I use mouse scrolling or other options. But when I do want to jump to certain parts of a page, I want that scrollbar. Just because "the data" shows it's clicked infrequently doesn't mean it's not important.

I hate the modern data-driven world. I'm convinced 99,99999% of people who use data for stuff like this don't actually understand what the data means and how large of a negative impact removing the long tail is.

I only click my "Start" button to shutdown the computer. /s