My take on why MS created RT version of Windows for ARM processors
For me, answer is rather simple. If what MS said is true, the company started working on their tablet (Surface) in 2009. In that time, Atom processors were “shit” – power consuming and low in performance. I think Microsoft learned the lesson and knew that their new tablet has to be thin, light and provide good battery life. These three things were totally impossible with Atoms at that time.
The only reasonable solution was to create a simplified, ARM version of Windows for mobile devices. And Microsoft did so not knowing than in 2-3 years, Atom chips will be able to provide quite good battery life and performance.
I seriously doubt that MS would consider creating Windows RT for ARMs knowing how efficient Atoms will be. On the Asus official site we can find some interesting specifications (size and battery life):
Vivo Tab (11.6’’, 675g, 8.7 mm - Atom): 10.5 hours (30 Wh)
Vivo Tab RT (10.1’’, 525g, 8.3 mm – Tegra 3): 9 hours (25 Wh)
Atom tablet has BETTER (~15%) battery life (~16% bigger battery capacity) with bigger screen (13%) and definitely more powerful OS. Thickness? Only 0,4 mm (!) thicker. Weight? 150 g more - but with larger screen it is natural.
Who else think that Surface on Atom would be much better idea?
PS: Surface 2 with Atom and Surface 2 Pro with Haswell? Maybe…