- 3D widgets serve a purpose and make it much easier to see what's a widget and what's not
- Windows XP theme engine was great and it got killed in Windows 7
- Windows XP and Windows 2000 UI was to the point and didn't waste screen real estate like 7, 8, 10 do as well as current OS X and GNOME or KDE. First we complained open source desktops had no designers, now we should curse the day we wished for designers to get involved.
- all Windows tools and subsystems got much better and featureful and there's new filesystems and subsystems, but you cannot take the core and slap on a different desktop environment like you can with Unixes. Back in the day you could use a different Windows Shell, but I don't know if that's still possible.
I have this suspicion that Cutler has a private build of Windows on his machine which still has Classic UI, but the product managers would never allow that to get published, or else they would be wrong to have killed it off in the first place. This constant desire to change the UI is unbelievable and hard to explain. Imagine if new knives would follow the same mantra. Many things work best the way they are with no need to change, and if change is wanted, something like Windows XP's theme engine is more than sufficient.