Precisely zero people claimed he designed anything.
It's not me who's assigning him anything. It's Apple. It's his role at Apple. He *oversees* the OS and hence, is ultimately the executive in the C-level who is responsible for literally everything in macOS. That's the burden you have to carry as a C-level executive worth 400 million in Apple shares.
This isn't complicated. At all.
There are qualified answers and there are people who throw words on the internet with nothing to back it up. The latter is what you are doing.
You don’t understand how a company like that is structured so you simplified it down to one person overseeing a lot more than he can oversee. He would be exhausted long time ago if he had to oversee engineering, developer kits, UI and hardware integration across the several operating systems that Apple has now.
That’s why you said ‘This isn’t complicated. At all.’
Because you’re completely ignorant of how complicated it really is and how several departments spread out across three buildings oversee macOS development. One person alone does not “oversee the OS”.
Why can’t you accept that Jonathan Ive’s successor took over his duties if you think “It’s not complicated at all”.
One person or even one department alone does not decide what macOS or iOS is going to look like, not even Ive when he took credit for the Yosemite design. Those decisions are spread out across the tech sector and also involve discussions with hardware manufacturers. This involves webs and networks of conversations.
A manufacturer says to a CEO ‘We will be able to develop large folding screens for a foldable tablet within two years’.
That CEO has a conversation about it over dinner with another CEO of another company about these new hardware developments.
Then they talk to the board about the ideas. Then they talk to seniors of every department to start designing concept interfaces for a large foldable touchscreen tablet and augmented reality devices. They start toying with the idea of unifying the interface across all their devices.
Within a short time we start to see pill shapes and circular buttons appear on several platforms at about the same time, not just at one company. This highlights how decisions are made sector wide and not at just one company. Conversations behind the scenes spread across companies so that no single person or single department is fully responsible for new UIs and interfaces. UI concepts spread like a virus and sometimes several people catch it unconsciously at the same time.
Now comes the downside. Sometimes the new UI ideas that spread across the sector turn out to be bad, but they move so fast that nobody can stop it until those bad ideas land on consumers.
That’s what’s happening now. This is when the entire sector gets feedback about what works and what doesn’t work.
This is cyclical and happens on average every 7 years. It was why Vista turned out to be a mess, then fixed in Windows 7, and then why Windows 8 turned into a mess which was fixed in Windows 11.
It has happened to macOS and iOS in the past too.