This analogy to OS X is completely unreasonable. OS X software and hardware is co-designed to work together, by a single manufacturer/developer. In fact, you could even say that OS X is specifically designed not to work on any hardware not made by Apple. Creating a "hackintosh" desktop is seriously difficult business.
Linux and Windows are nothing like that. With both, the ecosystem of hardware is quite large, and there is an implicit expectation that any OS should work on any machine (ignoring edge cases like embedded hardware). With Windows, this assumption works well because all hardware manufacturers test their machines with Windows. This is almost never the case with Linux, where even if you are lucky to find that a manufacturer has tested with one Linux distro, they might not have tested with your preferred distro. What are you going to do if your distro "isn't certified"? Just walk away? That's not a reasonable choice for many people.
Creating a "hackintosh" desktop is seriously difficult business.
I did it recently, and it's not that hard, if you stick with a subset of hardware known to work. Yeah, upgrades from each dotdot release take a little longer, but it's totally worth it.
Linux and Windows are nothing like that. With both, the ecosystem of hardware is quite large, and there is an implicit expectation that any OS should work on any machine (ignoring edge cases like embedded hardware). With Windows, this assumption works well because all hardware manufacturers test their machines with Windows. This is almost never the case with Linux, where even if you are lucky to find that a manufacturer has tested with one Linux distro, they might not have tested with your preferred distro. What are you going to do if your distro "isn't certified"? Just walk away? That's not a reasonable choice for many people.