On the contrary. We have historical accounts of what the development process was typically like for Apple's products that came to fruition. Have you even read the Jobs bio or interviews with former product developers? Are you even aware of the ATG group from the mid 80's to late 90's who conceived many of the software abilities you are just now seeing? You'd learn that making tech ideas a reality takes much longer than One assumes. To think that the development process is suddenly more efficient or less complicated under Cook is naive, especially since Cook is admittedly not personally involved in the process or overly demanding. You think they went from the watch's concept to final design in 16 months, in time for them to spend the next two years making production and marketing arrangements?
An educated guess?
Those aware of the Job's era understand how his philosophy defined the brand's appeal. The fans was different then. We were primarily interested in how Apple's core products served us professionally. You have different expectations when you spend twice as much on a Mac that had limited compatibility with the larger world's Windows PC-verse. Consumers understandably were wary of Apple's offerings for that reason. Apple's consumer-level products didn't gain momentum until Apple introduced the iPod. Joe Public came for the iPod and stayed for the iPhone. Only then did they discover the benefits of an elegant UX/UI.
Cook didn't steer or inspire Apple's meteoric draw on consumers. The iDevices attracted them and the effect snowballed.
Yes and yes. Imagine that he, or no one else, had done those two things (Which are just a snippet of the ideas that he championed). What would Cook be left to promote? What products would deserve your fandom?