That rule is broken thousands of times everyday in regional, major, legacy and low cost carrier cockpits. There are more important things to look at. Sully violated it, the Continental pilots in DEN violated it, the WN pilots in Midway violated it, I'm sure Babbitt violated it on a daily basis. But, the Mesa pilots in Hawaii didn't violate it because they were ASLEEP. I read the whole CVR and found it not nearly as bad as I've seen in a cockpit. Violating sterile did not cause this accident.
I think Mr. Babbitt should read the USAir 1549 transcript where Sully and Jeff are talking about the Delta/NW merger during the push, then Sully calls ops on his Cell phone while they are monitoring tower for takeoff.