Cook is just a major idiot. It's actually surprising he didn't completly fuck everything over. But it just shows how strong the fondation and initial strategy was.
I'm always annoyed by random idiots arguing that since Cook made Apple a shit ton of money, he must be good. By the same standard, cartel head drug dealers are extremely good and an asshole who inerhit a business with a captive market and just manages to make more money by raising price is just as good.
Outside of Apple Silicon, much of what Apple has produced in the last 10 years isn't really good. And even Apple Silicon has major tradeoffs that do not look like they'll improve meaningfully.