When a DDC sends a signal to a DAC that has reduced jitter and noise from the USB signal the DAC has much less processing to do.
.. "much less processing to do" is just like "do less work to clean up the incoming signal"
The DAC is doing the exact same amount of processing whether the incoming signal has jitter or it doesn't. The DAC operates exactly the same either way. The DAC doesn't have a circuit that detects jitter or noise and then "does more work" when it detects it.
Again, I use a DDC so I'm not pushing back on the idea that they can improve the outcome, I'm just saying your explanations about how that happens make no sense.
At the end of the day I realize my concerns don't really matter, how it sounds matters, but as someone with a background in electronics, it just bothers me when people offer explanations about how electronic circuits work when they really don't understand them.
so I'll let it be