Granted it seems like a waste of time since common sense things like that should not have to be reiterated, but (as we all know from experience) common sense ain't common.
This is catering to the lowest common denominator. It is the mentality of our society today. The majors that I have attended, everything that was covered in these meetings is written (or could be) in the sups. If you don't, or can't read them, its the drivers/entrants fault. We don't need to waste 30 minutes of everyone's time for a few that aren't capable of self management.