Cool post, and definitely a concept devs should consider. I've only experienced the garden variety of offline (hiking out if cell service, not having a phone data plan, etc - not a government in chaos), but I still find offline capability super handy.

Especially even basic stuff, I know Google Maps used to 'expire' offline maps every 30 days. Like, I have a 40 day old map and no service, but it won't tell me where to go (dunno if they still do that or not - ditched G Maps a long while back). Some more thought into "hey, what if people are offline" would be nice.

Edit: Also, shout out to paper too. I've got a bit of reference books (maps in my car, a copy if the survival medicine handbook at home, etc). Necessity might be the only way to get my Gen Z self to read a paper map, but could be handy to have.