Do you see lots of smoke and flames in this video? There are several people outside already, with backpacks too. It is incredible how people feel entitled to, based on a split second from a video, judge so harshly another human being who just went through a traumatic experience. We weren’t there. The situation looks under control. For all you know this person gave their turn to others inside the plane so they could get out before her.
I'm not judging harshly: adrenaline dumps are a real thing. And even though it looks under control, a few passenger interviews have indicated that many folks didn't have time to think.
But the whole point of all those procedures about turning stuff off and putting things is away is situations like this: you may or may not have time to think, and you may or may not have to deal with smoke or flames. And just because there weren't smoke/flames right at that moment, you can't tell if they would arrive "soon": planes have been completely engulfed in fire with-in 90 seconds in the past.
The idea behind suggesting a fanny pack, and perhaps having all your cards and papers (and medicine) on your person, is so that if such a thing should happen you do not have to think to make sure you have what you need. So that in a panic you already have it with you if you get out just by the fact you got out and it was physically attached to you.
On a second read, my original comment was unkind and I regret it. I lumped you in with all the other comments which I saw as unfairly criticising a situation most of us will never be in and responded with mockery, but that is neither an excuse nor fair to you.
Your points are well reasoned—and I believe well-intentioned—and I should’ve done better. I apologise.
Heaven hath no fury like someone who works a desk job and lives the apartment/condo/nice subdivision life and is generally free from any physical danger judging other people's risk assessment.