I have to agree with him there. I used to run one thinking that at least twice in a movie I was going to not roll on one machine. But the fact is that hitting two record buttons does indeed make it somewhat easier to miss one of them.
|The Japanese version of Robot Revolution.|
The other thing is that the sound department is the only department that even considers running a backup. There's no "backup camera" running while the regular one is running. And, of course, sound can be replaced in post. And sometimes that's just easier anyway.