Because they don't know how to count, Why? Because Window 10 is coming. Yes This will be the next OS after 8 as they are skipping windows 9 and making windows 10 sometime in 2015.
It like how they went from xbox 360 to xbox 1 we littles need to show them how to count and the ABCs . :P
This OS will bring back the the start button and fix a lot of the problems windows 8 had.
Unless 7 8 9 D: