Yes, to all those reasons to print paper. I print two copies of the flight itinerary and put one in the outer pocket of my carry-on roller bag in case it gets gate-checked and separated from me. The other, I keep in a folder along with any hotel bookings, conference information, etc. And, usually, printed piece maps showing the locations I need to find if it's an unfamiliar city, with public transport directions.

There are all sorts of reasons why I use the phone versions solely as backups. Trying to use a tiny map square on a phone is unpleasant; I don't want to hand my phone to people; there may be weather conditions or locations where I don't want to take it out; and it's just easier to hand someone a piece of paper. The hotel bookings and flight itineraries/boarding passes end up in my expenses file for tax purposes.

wg