You see OSX was and still is the best *NIX out there. I grew up with linux; I really don't need to be educated about it. It is a fine OS, sadly still begging for Adobe and other 3rd party support and some nice matching OEM hardware. I hope you are not suggesting I should give up Ligthroom, Photoshop and all my work's software.
I appreciate you may be unaware of some IT history. MS has tried to prevent any other OS and even non-MS applications on PCs. MS used dirty business practice to stop manufacturers shipping with competitor software. MS has branded OSS as cancer. That is as close to corporate evil as it gets and the fines by both US and EU clearly confirm that. Or to put it the other way round, there would be far less and worse choice for consumer if they got the upper hand.
GPL and other open source licenses are the single biggest reason we have linux and android in particular; it is the underlying base of OS X, and it is the reason we are not stuck with IE6 as the only browser. Chrome(ium), Safari (KHTML) and firefox are all Open-source or closely derived. MS had to write XML based Office file format instead of the clumsy and proprietary mess. There are far more examples around. As a result consumers are given choice and transparency.
Finally you may or may not be concerned about NSA / GCHQ backdoors and competitor spying. If you run sensitive business you might. Well open source is the closest we have to ensure it doesn't happen. CyanogenMod version of android is certainly the one to use on the smartphones.