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Summarily, it's because operating systems for general purpose computing are not currently designed to provide any kind of near-real-time scheduling for certain activities.
The real question is, why haven't they implemented such options yet? Why isn't there a Windows/OSX version customized for DAW/audio/video/etc use? It may or may not need to be a radically different kernel, but what it would need is a 'control panel' that allows you control over the scheduling schemas and ability to fine tune the performance of your system depending on your particular applications and needs. For example, it would allow you to mark the drivers and processes that require high priority scheduling at the expense of all other systems.
Surely this is feasible, no? To anyone's knowledge, have the big OS vendors ever considered making such "near-real-time" versions of their OSes for the omnipresent and ever-growing market where personal computers are the cornerstones of all modern technological crafts ?
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