I ditto that in case of getting burned alive inside - having broken leg during escape sounds like a bargain.
In my conversion all windows open widely, so opening is not an issue, but windows are 7 feet above the ground.
Once I managed to lock myself inside, due the outside tumblers and even taking my time to prepare for climbing it was not that comfortable.
Sure did not plan on broken leg.
Disaster preparation is always difficult issue.
Being home repairman in earthquakes area I see it all the time.
After each "bigger one" homeowners stuff water and canned food in the basement. After few years, when the supplies age, they throw them away and then next bigger one comes and process repeats.