I'm not one of those who pins tails on executives, and see Forstall as neither hero nor villain, but you neglect to mention that he was difficult to work with, if not an ass, and at odds with the other top executives, including Ive and Mansfield, who was ready to follow Fadell and the apps group lead out the door because of that friction.
Rolling its own Maps app was hardly a task to be underestimated, given that Google had a seven year lead, but the accounts of poor management and high turnover rested on Forstall's shoulders.
When you're not the co-founder of the company, not producing results, and are enough of an asshat to encourage others who had done their jobs to quit, you can't expect to be employed long and will likely be shown the door, no matter how brilliant you think you are, especially when your most powerful ally is gone.
A toxic personality on top of poor results was his undoing, and his worth no longer justified his continued tenure.
That would apply at any company, and with any boss, not just Apple and Cook.
I've heard those rumors as well. And one more I've heard was that after the Maps failure, Tim Cook asked Forstall to make a public apology and he absolutely refused. I believe that refusal was the last straw, which in combination with the other issues you mentioned, pushed it over the edge.
Still not clear to me if apple would have been better to keep him. I definitely feel he would have resisted some UI changes, where those changes made IOS less intuitive. I associate his reported enthusiasm for skuomorphism with a desire to keep buttons looking like buttons (as opposed to labels) and date pickers looking like slot machines (making their purpose clear)
I think newer users are truly slowed down by some of those changes
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