I'm sure that is the root of many of the differences of opinion here.

I am thinking of SHTF as in the book "One Second After". Where lack of food is a major problem, water delivery is problematic, people are dieing right and left for lack of medications, few vehicles are running, etc. Under those conditions, widespread across a very large geographical area, I don't see any electronic device being your holy grail.

A more localized disaster, where once you escape the immediately affected area you find everywhere else is still normal, then an electronic gadget may well be of help to you.