It really is NOT that simple. It would be like Nvidia updating their motherboard drivers to only support their graphics cards, as they haven't given ATI a license. Or Sony decieding that their HDMI out verification from the PS3 will only be compatible with other Sony devices.
Not really comparable. HDMI and PC architecture are based on standards - hell even HDMI might be licenced? Not sure. Any device connected to a PCIe or an HDMI port would have to work otherwise it'll be breaking the standards, so no one can be locked out.
Microsoft have designed their own controllers with their own memory unit designs which may or may not be patented - it's an entirely different situation. If Datel don't want to work with Microsoft to get their products to work through licencing or other means, how can they expect support by the software/hardware which is entirely proprietory?
EDIT: Sony did the same thing with unlicenced Dual Shock controllers on the PS3 not so long ago, didn't they?
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