What I also like about GTK’s scrollbars is that the scrollbar only auto hides when the scroll area completely looses focus. As long as the mouse cursor is hovering anywhere in the scrolling region the scrollbar is visible, so you don’t have to scroll first to see where the scroll position is.
When I was in like grade 10ish in high school one of our teachers showed the class this meme or a similar one and one of the other kids went “wait, does that happen?” in a genuinely confused tone. Almost the entire class just stared laughing and the teacher had to explain that no, it doesn’t happen because the earth is not, in fact, flat.