As a user of a laptop, the reason I use arrow keys to scroll is because of infinite scroll. Websites with that feature are effectively unusable via the scrollba

As a user of a laptop, the reason I use arrow keys to scroll is because of infinite scroll. Websites with that feature are effectively unusable via the scrollbar because it gets hijacked as you're in the middle of using it, move from 50% to 25%, and suddenly you're pressing down on 50% of double the original lines and get jerked past a quarter of the open entries in your feed. It's a terrible experience that forces you to use arrows or the scroll wheel as a workaround, not because that is an actual preference.