Mac OS didn’t do this, but the marketing of version 10 as “OS X” set the stage for everything to come later. With other products, they did it with Final Cut Pro X and QuickTime X
iMovie also did something interesting where they went from marketing by year of release to version 10. Luckily, there was iMovie '09 and iMovie '11 before that, but no 2010 version. So limited confusion.
Apple’s done this with more than just iPhones.
Mac OS didn’t do this, but the marketing of version 10 as “OS X” set the stage for everything to come later. With other products, they did it with Final Cut Pro X and QuickTime X
iMovie also did something interesting where they went from marketing by year of release to version 10. Luckily, there was iMovie '09 and iMovie '11 before that, but no 2010 version. So limited confusion.