Windows 7, which was Vista's equivalent to SP2 also has some fans. Heck, I'd even personally argue that Windows ME has some niceties not seen in subsequent releases, particularly when combined with Active Desktop (which I'm pretty sure did not survive the transition to XP).
I wonder if/when some subset of users will prefer a more controlled window layout engine, one which always opens windows into their own "space" on the screen. To that end, I don't actually mind how iPad does its window layout, I just wish iPad had all the features and openness of macOS to install your own drivers, background apps and virtual devices/mixing. A simpler UI can actually be a good thing, but you shouldn't lose functionality when making things simpler. A simpler UI doesn't necessarily mean less complex operating system...