But I don’t agree that it “looked nice”. I hated Windows 95 and 2000’s “style”. They looked like engineers had made them. They looked stiff and unfriendly, eith too much border and outline. Real life has no outlines. I was in my late teens when 2000 came out. My friends and I jumped on it and felt it was the Os we had been waiting for.
But even then I thought it looked like shit.
The affordances were great. I agree that details like button depress and consistent scrollbars are valuable.
But I genuinely prefer things a bit rounder, a bit flatter, less grey, or late Aqua-style flat-with-shiny-affordances.
I agree that backgrounds should be flat (or very subtly textured so they recede but arn’t “boring; again, late-00s Mac OS nailed this for me).
What I’d really like to see is something new that takes the consistency of NT/2000 and Mac OSX prior to Lion, mixed with the novel affordances of BeOS/Haiku (docking windows, small title handles), and puts it through Apple’s “zing” (but not too far - transparency is highly overrated).