I… don’t believe this. Reviews of the day were preoccupied with drooling over the graphics capabilities, given that it’s a mostly-objective thing to compare and were often the only visible thing that changed in an OS release. If you look at the embellishments that UI picked up they evolved in lockstep with the capabilities of the hardware. As soon as there was sufficient color depth for shadows, then shadows were added. Once that expanded to sufficient color depth for gradients, then gradients were added. Same with transparency. Once MS Windows got a GPU compositor in Vista we got “glass”.