Windows Phone is discontinued, but sure as heck wasn't experimental. I've used it flawlessly since about 2011 with rock-solid stability and battery life.
I agree that it is similar to Google in that they seem to hedge their bets too much (like how Google has two OS, two languages...etc etc). I would really like a third popular OS...there are so many out there, but with no steam (this, firefoxOS, sailfish...)