To be fair, there is a lot of things they could brief you about on Decompression. However the only mandatory brief is the one in the early evening before dinner. Do you really want the 40 - 50 minute briefing extended? And to be fair, most folk don't even take much notice of that.
Having just done decompression I thought they hit it about right for the 23 of us! However, they could easily have spent a couple of minutes detailing any specific discounts or offers or handed us a fact sheet.