If the CC are going to take the time to go through the safety briefing, it is only polite to pay attention.
A matter I've brought up a couple of times with CC on BA is that in the A319 and 320, the automated briefing tells you to vacate using overwing exits in the case of a water landing. "Other exits may be opened if above the waterline...." However, when a manual briefing is done, this is not mentioned.
The response, give them credit, is that it is a valid point that they will raise with their supervisors.