After all, if everyone sent out their emails, so to speak, what would be left for the meeting? I mean, what are the odds of someone discovering something worthwhile to communicate to the team just seconds before the meeting starts? Any earlier and the email would have already been sent and there would be nothing left for the meeting. Maybe it happens once in a blue moon, but regularly across a wide number of people? No way.
I've never attended a status meeting that was completely void of participation, so there must be withholding of information done so to pad the meeting. Not everyone may feel such pressure, but it is apparent that some – and I dare say most – do.