I think that is great info for 2004, but times have changed, and computers are a big part of it. 4 channel recorders like the R4 and R44 are reasonably priced, so a lot of people (including myself) run 2 SBD + 2 AUD and mix at home on the computer.
I think the ability to "mix to taste" at home is a huge benefit. Not only can I cut out the SBD/AUD delay, but I can decide how much SBD and AUD I want in the mix... Frequently it's 50/50, but sometimes it's 80/20 SBD, and other times it's 80/20 AUD.
Nowadays the question people generally ask is "I recorded 2 mic tracks and grabbed the SBD tracks from my buddy. How do I align them properly?"