You'll need to first avoid succumbing to smoke inhalation or flames if you don't get out in time (or cause someone else to not get out because your fumbling).
The take-offs and landings (and perhaps add approach) phases of flight constitute ~5% of flight time, but the vast majority of the fatalities:
* https://flightsafety.org/asw-article/loc-i-accidents-led-oth...
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.
Your points are well reasoned—and I believe well-intentioned—and I should’ve done better. I apologise.
It also goes without saying that you should keep in on while showering and sleeping too, you never know when your hotel could catch on fire.