Well, if your attitude is better safe than sorry, I can certainly go along with that.
I wouldn't characterize it as 'his' attitude...it's what the code says. The code book doesn't elaborate WHY certain things are not allowed, only that they are...that is what jwelectric was relating. Over the years, lots of 'whatif' situations have come up and the codes get modified to account for them. Generally, the goal is to improve safety and avoid one of those 'whatif' situations.
Important note - I'm not a pro
Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013