Not to be too pedantic, 10 Gb/s over SFP+ is still "10GigE", even if it isn't the format Apple is pushing for. It's unfortunate that there are so many competing approaches, and a case can be made that Apple should've picked a more popular one.
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Nadella really has no reason to care one way or the other.
If web apps work well enough, that's what they'll push everywhere; if native iOS apps continue to provide advantages as they currently do, that's the path they'll take.
Elaborate.
(No modern application is, or should be, less than several layers away from the OS kernel. And especially not in today's age of heavy sandboxing.)
Yes, he has little reason to care about Windows any more, and it shows. If they were any more honest, they'd had put UWP to the grave long ago, let existing desktop app developers focus on WPF, and meanwhile tell a story that web apps are the future. Unfortunately, they can't even agree on that internally, much less admit it externally.
Web apps (there really isn't a need to coopt a silly Google marketing term) are good enough for many purposes, and native apps are better for other purposes. There is no contradiction here. Apple needs to forge ahead and keep improving AppKit and UIKit, and make more first-party apps that show it.