The other old thing was heterogeneous hardware. We had x86-Wintel for a long time, with all the emphasis on generic CPU speed and RAM and desktop OSes. People t

The other old thing was heterogeneous hardware. We had x86-Wintel for a long time, with all the emphasis on generic CPU speed and RAM and desktop OSes. People took that level of homogeneity for granted. Now hardware and software are each getting more specialized. New smartphones are more stable than they used to be, though. Used to go obsolete way faster.