One advantage of printing the tracks is that if you want different mixes, like an instrumental mix, without guitars, etc..you can just assign your tracks to multiple outputs using ctrl (or command, im not sure) and click on the output in the mixer, and print your different mixes at the same time.
That's what I said I preferred (recording to disk = printing to a stereo track within the session).
I'm fairly sure they recommend this because of the possibility of the bounce mishandling any automation.
I just wanted to point out that RTD and BTD null because people tend to argue about which sounds better when it can be proven that there is no difference.