From the few eye-witness reports I've read/heard, it doesn't sound as if the cabin crew were organising the evacuation. It sounds as if the passengers were managing the situation largely by themselves. So there may not have been many loud voices shouting 'No hand luggage! Jump!'
If Korean flight crew are dubiously trained, is the cabin crew training any better?
I always travel with my passport, documents, money and cards in a small pouch that I keep with me and usually have attached to my person at take-off and landing. I'm quite surprised that this isn't standard advice from airlines, and equally surprised that duty-free outlets don't cash in with sales of small cross-body pouches.