Ok, don't take this as arguing the people should grab their luggage, but at the same time the number of problems it's caused seems to be very small. I was curious so searched and saw a lot of pearl clutching statements like "everything turned out ok, but THOSE PEOPLE WITH THEIR BAGS" and incidents where people did actually die but it's not clear that bags had anything to do with it.
For example, a very commonly cited one is Asiana Airlines Flight 214. People did grab bags, but there were two other major issues that caused bigger problems. One, at least one of the slides inflated inside the plane on impact. Two, the pilot didn't order an evacuation for 90 seconds until he saw a fire start. Despite those issues, everyone still alive evacuated successfully. Yet it's still one of the ones you find when you google for this topic. The three people who died? Not due to baggage or other delays. Two weren't wearing seatbelts and were thrown from the plane. The other was crushed by the door during the crash.
Again, I'm good with the idea of leaving bags behind, just saying it's not likely going to move the needle much in terms of accident results and probably an easy to vilify target that's a distraction from other things that matter more.