I don't think that's true. Apple Watch? Market leading product. Took something very nerdy and made it fashionable enough that people from all walks of life wear it. Got the form factor so right that even a decade later it has changed very little. Of course there were missteps in the quest for thinness with the laptops but I still preferred my Touch Bar MacBook Pro to any non-Apple laptop I've ever used. If that's the worst he did, that's still better than almost anyone else.
He's still a great designer, the problem though is that without the right kind of editorializing force he'll make mistakes, usually in the form of compromising practicality and functionality for the sake of aesthetics. I should probably clarify that this isn't some fault unique to Jony Ive. It feels like it's common among designers and probably just creative people in general.
