When was the last time that you have actually used a Mac for work in a business/enterprise environment? When was the last time that you have tried to use a Mac as a work horse in a data center? And when was the last time that you had to use a Mac with a non-American keyboard?
For a home user who only surfs the web and watches the occasional movie on its machine, everything you said might be true. It might even be true when your definition of work means using Adobe Creative Suit. But everybody outside of that clientele knows that your statement simply isn't true - and never has been. It's a repetition of Apple's marketing mantra, but there are no real world facts to support it.
I'm typing this on a 13" Retina MacBook Pro - that currently runs Windows 8.1 Professional as its sole operating system. Why does it only run Win8.1? Because Yosemite is a royal pain in my work environment, which is a data center at a satellite communications teleport. Even desktop Linux is a more reliable and useful choice where I spend my working hours, and that's saying a lot.
And even if Yosemite did not have all the compatibility and stability problems that it has, its performance is horrible when compared to Windows or Linux on the same MacBook - it's a simple fact that it's the slowest of the three platforms. But performance isn't everything, I agree. If an environment generally is a pleasure to use, a performance hit here and there is a price everybody would be willing to pay. But the next reality is that OS X is NOT more comfortable or easier to use than a modern desktop Linux or even Windows. It's just different, and very often it is only different to be different, not to make things better for the user. Finder compared to Windows Explorer, for example, has been providing an inferior user experience for decades now. Quick Look is awesome, but Finder, pardon my French, is an inferior and unstable piece of crap. Not having the menu bar in the application window has been annoying me for years - but I'm using large screens or multi-screen environments. As long as you're on a single notebook display this is not much of a problem. But when you're working on a 21:9 display or two large widescreen displays this design choice of Apple's becomes immediately counter-productive and intolerable.
But my all-time favorite is the disaster that Apple produced with their non-standard keyboards. I'm using a German keyboard layout and this is the most painful thing to use when you spend your days in terminal windows. Why is there no "delete" key on their notebook keyboards? Why do they not label the braces, pipe symbol and other "special" characters properly? Hell, the whole PC industry gets that job right - only Apple seems to believe that everybody on this planet was born in California.
And if you really want to feel tortured, use VMware's vCenter with a web browser running on OS X. Enjoy the constant crashes. Enjoy the frustrating keyboard incompatibilities.
Macs are so much better and more convenient to use? Not where I earn my money.