Scrollbars. Ever heard of them? They’re pretty cool. Click and drag on a scrollbar and you can move content around in a scrollable content pane. I love that shit. Every day I am scrolling on my computer, all day long. But the scrollbars are getting smaller and this is increasingly becoming a problem...
I like the way GTK is doing it. You have a thin scrollbar that is overlayed over the content and has no background (so just the knob) but when you get near it with the mouse, the background appears and it becomes double as thick. That way you're not wasting any space but you don't have this issue of it being hard to use either.
Minimalist design really went from "maybe 38 different clickable links isn't the most optimal way to get around this site, we should probably optimize how we use screen space" to "WE MUST GET RID OF USEFUL FEATURES SO WE CAN DISPLAY 5-8 MORE PIXELS OF WHITESPACE" in the span of a decade lol
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.