Evolving backwards would be returning to ergonomic UIs with clear HIG being followed, having a scriptable variant for every class of applications, and any piece of software, OS UI included, not acting as an advert. Contrasts and colors and bright pictures are not what I need to see while working. It's as if your screwdriver was built in the form of an alien fish dildo, and had a chain of ringing bells. Why is this bullshit considered normal and usual with computer interfaces, I dunno.
And a company's website is its interface to the world, for the user. Not its advert. They've already seen the advert or don't need it if they are on that website! They want to actually use it.
After W2K I didn't like XP all that much, it felt slower and was too "Chinese-looking" (how it could be said in my language in those years). Now I'm nostalgic over chromecore aesthetic and that look, silver Game Boy, silver PS2, silver SW Phantom Menace interiors. Or matte black as an alternative, too looking very cool. Or at least that "normal" matte white. But in UIs - XP felt a bit too much, tiring for my eyes. Still, XP with default blue theme and jump-to-lightspeed wallpaper is what home and nostalgie are for me.