Going to be very interesting to see how they go about implementing this. So much is different about the UI of Mac Os and iOS, that I'm guessing at the very least you'll need different views for each platform.
That'll be because Windowserver now uses Metal 2 to render UI, so if Apple's claims that it's 10x faster than Metal 1, then that's probably where the UI performance improvements have come from.
What ever happened to the 2nd wave that security experts were warning about, without the kill-switch code? Haven't heard any reports of this being found in the wild yet. Anyone else?
All pretty trivial stuff compared to the massive positive impact the products he oversaw and introduced to the world have had. Mac and iPhone literally changed the world as we know it.
Without him, home computing would be very different today. His insistence on focusing on usability and bringing in the best of the liberal arts into a very science-centric domain was his genius.