I'd be curious to know where all these complaints are, especially considering its a developer preview that the majority of users don't have access to. Care to share some of the websites where there are lots of about it? If you believed the internet there was all this hate over iOS 7 and yet Apple is selling more iPhones than ever.
Because iOS 7 doesn't rely solely on a design. The hardware and features in iOS plays a major role. As I said, I installed it because I loved the features more than I hated the new design, and all my friends did the same.
And yes, I'm using the word "design" because it's not just about the GUI. The way the new music app is designed, to name just one, is terrible, terrible, terrible... It makes me
hate my favorite artists because I'm almost getting a depression when I have to scroll through 40 pages long just to find a single song in my 30 albums. Also, Maps, wrong data aside, looks like a joke compared to Google Maps. There's a fundamental problem in why the Remote app and the Music app are so different. iWork on iPad is hard to use compared to the new Office suite with the Ribbon interface, it's like they tried to hide every control in an awkward way to give you something close to a full-screen view.
As I always said, design-wise, iOS 7 has a ton more problems than Yosemite.
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What I would like though, I talked about it in another thread, is that OS X implements the tinted-color controls, like in iOS, to give apps a little bit more personality. If they are to port features and design trends, now
that's a feature that Apple should port. I'm sure OmniGroup and Microsoft would be glad to use it, because all the apps of their suite have a specific color (Word = Blue, Excel = Green, OmniGraffle = Green, etc.). iTunes could use Pink, Contacts could use Blue, Calendar could use Orange, etc. like on iOS.