I'm all for OS X adopting more and more of iOS because it's great for the user experience. However as a hacker it feels wrong to have a computer that is as locked down as iOS devices. BUT Apple showed me that they are listening and still want to cater to developers when they announced GateKeeper (http://www.apple.com/macosx/mountain-lion/security.html).

I have a few friends who are switching to Unix instead of Mac OS X because of the direction it's going. For me, it's going to be all about how much Apple allows developers to innovate on their platform. We'll see what happens, but GateKeeper is a good sign.