Of course, in Bill Gates' defense (no matter how much I hate him for ruining the computer market since 1995), I must say that I believe since XP or Vista he's no longer involved in Microsoft, so he never finished it all to "10".
Of course when taking this to Mac, where we first had "Cheetah", "Tiger" and "Jaguar", we suddenly get introduced to cat-races I never knew they existed like "Yosemite", "El Capitan" and "Sierra".... Something is really wrong there :P