I doubt it has anything to do with the DACs. I think it's related to the core DSP functionality. A DAC is easy to implement, and they aren't all that expensive. HDMI/all the flavors of DD/DTS/9.1/11.2/room EQ/software/hardware/audio/video/etc, is a lot more difficult to implement and integrate.
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If it's not worth waiting until the last minute to do, then it's not worth doing.

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