Obviously not essential, but NFL tickets no longer have a paper option. It is app-only.
It was a shame because I would have liked to give out maps to the kids so they could navigate/orient themselves.
A few days afterward, I actually went to the trouble of printing nice legal-sized color versions of the map at Staples to give to the kids as mementos. Sure enough, they loved looking at and discussing those maps just like I did as a kid.
Next time we go I'm printing maps ahead of time so we can have them while we're there.
MLB, NFL, NBA, and NHL all do this with league-branded apps and/or partnerships with Ticketmaster, etc