Earlier quoted context omitted.
> My argument is that having this specific option is a mistake. That's a belief. I don't see any argument here. Why is it a mistake? Perhaps modern users, not tied to a legacy of scrollbars, could not care less about them? Perhaps 95% of users (with the exception of hackers) not even use them or notice them when they are there? > Those people are not designers, and should not ever be put in the position of designing…
"Designers" should never be put in a position of designing a UI. Claiming the mantle of "designer" usually seems to reveal a preference for static aesthetics over functional utility. Nearly every time I see someone talking about "design" in the realm of user interfaces, or about making software "beautiful", they're invariably attempting to use concepts applicable to media intended for the presentation of information…
If you have found a "Designer" who is overly concerned with how it looks and not so much how it works, the conclusion to reach is that you have found a bad designer, not that all "designers" are concerned only with aesthetics.