1) Because I feel Apple has screwed me. The iOS 8 update has turned my iPhone 4 into a brick. My phone now does everything iOS 6 did, but now it is slow as hell. In return, I get nothing new worth of mentioning besides animations (what a giant leap forward, Apple) and eye-bleeding colors. And turtle speed and constant hang-ups.
2) Apple isn't innovating anymore. They are busy adding "features." Sometimes the way iOS 8 works makes me think the whole iOS division lacks ideas about what else they want to add, so they are simply throwing stuff on the wall. It's hard to believe how dysfunctional iOS has started to be when Jobs left.
3) I still get eyebleeding idiotic colors on this Android device, but A5000 is four times cheaper than iPhone 6, and it delivers the same functionality, plus dual SIM capability for travel, and a 4000 mAh battery. (I am not associated with Lenovo, that was an impulse purchase.)
So after 6 years of having everything-Apple at home and at work, I think I am starting to leave Apple. Sad and happy at the same time.