A couple of days ago I heard an account of someone on a flight where they lost an engine on take-off. It was supposed to be a long flight, so presumably had a lot of fuel. The briefing apparently included explicitly pointing out that if you stopped to get your bag on evacuation then not only might you die, but so might everyone else waiting behind you. Nothing like spelling it out, and probably giving the passengers behind an incentive to shove people out of the way if they tried it.
However it was noted (and it was a woman telling the tale) that 'carry-on baggage' didn't appear to include women's handbags/purses because they all took them. To be fair, most of them probably already had their purses surgically attached so there was most likely no delay.