My point was that a general "no app shall customize scrollbar look and feel" is wrong, as there are certain kinds of apps that do benefit from custom look and feel. Sure, not all games, but also games are not so entirely different from other kinds of apps.
Also, I thought the specific points about CSS and how to achieve custom styling if desired are irrelevant. The arguments I was replying to were about UX, not about details of how that is implemented.
Also, I thought the specific points about CSS and how to achieve custom styling if desired are irrelevant. The arguments I was replying to were about UX, not about details of how that is implemented.