8th Gen = Xbox 1, this launch was won/lost at the infamous E3 where they talked about anything but games & DRM along with the stupid way to share games. While PS4 was Faster on Specs, easier to share games, and didn't have DRM non-sense. A disasterous launch that MS never recovered from. Basically, the PS4 beat the XB1 in a 2:1 ratio. It's VERY BAD how they were defeated so handily.
Someone pointed out this was the worst generation to screw the pooch on because it's when people started buying games digitally on a regular basis. And if all your digital games are on PS4, you can't play them on Xbox Series X without buying them all over again.