While I agree with you, I think you're forgetting how little competition there is as far as desktop OSes go. Microsoft is practically trying to run Windows 10 into the ground (disable pro features with the anniversary update, then force everyone to upgrade to Enterprise, for example), while Apple will never officially allow OS X on anything other than their products even if hell freezes over. This leaves Linux as a serious competitor with significant advantages in its community driven design, that allow a group to fork and existing project and make a modern desktop OS suitable for the average user. The problem is mostly that no one has bothered to do that, or done so successfully (Chrome OS was a great try, and I think it's here to stay, but it's still a little too locked down).