Earlier quoted context omitted.
On macOS at least, it's not one change, it's at least four: - scrollbars overlaying the content, rather than having dedicated space - scrollbars that auto-hide when not in use - scrollbars that are initially narrow, then widen when you mouse-over - removal of the scroll buttons That's not including the visual design changes, which are arguably important too (e.g. the scroll "thumb" now has a very flat design rather t…
That's all one change, because they redesigned it once! You can't just pick apart all the elements of the design to claim its multiple changes. I agree the proportional scrollbar was good.
Many changes are still many changes even if they happened at the same time. You can't just lump together all the changes to the design to claim its only one.