A crank, if it’s a particularly good one, is useful if you have to make one call, right now (or in a few minutes), briefly.
In an emergency situation, what else do you need to do (electronically, that requires battery power) besides this?
I can see trying to obtain your current location via a GPS capable device, and then calling for help to be sent to that location. What are other emergency electronic concerns that I am missing? I am talking short term emergencies - not long term years and years of trying to power you HAM radio outfit from batteries.
I would venture a guess that a device with one fully charged set of batteries, and maybe a power bank if that device is especially battery-hungry, would pretty much cover your emergency needs.