I believe people were about to vow an eternity in Mavericks if Apple brought the colorful design of iOS 7 to OS X. I don't see anyone complaining today, so I'll break the ice
I think the design is great, but, just as I found on iOS 7 as well, the dock's design is a step backward. That translucent glass effect makes the OS look a bit outdated, and the high-contrast green and blues make some things feel like they were made in MS Paint with primary RGB colors.
Apart from that, though, this keynote was amazing.
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I agree. Specially when they somehow try to say that Windows 8 has been a failure, when its market share is
higher than all versions of OSX put together. And that is giving OSX for free...
Their point was actually not the market share relative to competitors but market share within its own ecosystem.
If you design an app for Windows 8, it will be accessible by only 14% of Windows users even though it was released 2 years ago, whereas if you design an app for OS X 10.9, it will be accessible by 51% of OS X users and it was only released last year.
From an OS X developer's perspective, this is great news because we don't have to worry much about backwards compatibility and fragmenting our applications into different versions, as the users of OS X are almost all on very recent versions of the operating system.
I may still get more users on Windows, but I have to make different versions of my app to fit the criteria of each iteration. It's currently not very attractive to make apps for the Windows Market because the user base of Windows 8 and 8.1 are tiny compared to Windows 7. It would be better to make an app for the Desktop environment which will work on Windows 7 and Windows 8. This keeps users stuck on older versions of the operating system, and the over $100 price tag from Windows 7 to Windows 8 is a move that still baffles me (it encourages people to stay on an older version).
Everything said here applies to Android as well -- and is even more relevant because unlike OS X vs Windows, iOS
does have a very big chunk of the market share.