I wonder if, when people criticise Tim Cook for not being a product visionary, realise that that was never his role to begin with? His job is more to oversee the day to day operations at Apple, freeing up the industrial designers to come up with future products. At best, they may also determine other factors such as pricing and marketing strategy, but otherwise, the final design of products ultimately rests with Jony Ive.
The chief product visionary at Apple is clearly Jony Ive and his team of designers, who oversee product design and have the final say over the user experiences related to Apple’s product line.. It is Ive's vision which guides the product strategy at Apple. I guess that if there is one downside to this arrangement, it's that Jony Ive basically enjoys unchecked power at Apple.