I think Dave touched a bit on that on EEVblog #738 - Yamaha DME32 Digital Mixer Teardown @12 minutes:
I think he also goes a bit more in detail on other instances. Edit: like at 32minutes towards the end.
Also check out this video that explains Shared Return Paths specially when you have both digital and analog components:
I agree that a video by Dave explaining this would be a nice addition, maybe not a blab but a fundamental Friday kind of video.