Android is far too fragmented. You have every manufacturer with a different overlay on top of a different version of Android and by the time a new version hits you will probably be just now getting the last version that's been out for months.
android have choices. Galaxy series , One series, droid line release one flag ship a year. Galaxy note is for a niche group. samsung make a lot of mid range and low range phones for budget customers. Google make money off their services on phones so they want the market saturation of android phones. 1 million activation a day