For online tickets, you can usually download them. If not, I just take a screenshot (both Android and iOS have built-in support). I've traveled on Ryanair just fine using them.

For maps, there are plenty with offline support: Google Maps, HERE, OsmAnd, etc.

I'm not criticizing your approach, just saying that I've never felt that need. Official paperwork, on the other hand, is still a pain; our local governments seem particularly adverse to digital documents.

uh yeah, i understand you can use a phone offline. but i'm just not going to rely on my phone to get into a place that i traveled to get to. screenshot, offline, blah blah, what if the battery dies? what if the damn thing just stops working, like it has done multiple times in my life? what if someone snatches it from me while it's out in my hand like it normally is? what if someone spills a drink on it while it's out on the table at the dinner before the show?

how do you think i know of all these terrible scenarios?

i'd rather hang on to a piece of paper, and if i lose it, then i have nobody to blame but myself. call me a luddite.

No need to get defensive, I specifically said I wasn't criticizing the paper approach, just explaining why I don't worry about bad reception.