Case in point: I traveled from St. Louis to Houston for a concert a few years ago. Before I left home to catch my flight, I installed the Ticketmaster app on a phone and verified that I could bring up the tickets. When I tried it again in my hotel an hour before the conference, it no longer worked because the fraud detection in their app was apparently confused as to why I was now in Houston.
Fixing this took 45 minutes on hold to get a support agent and a frantic call to my wife so she could check the disused email address I used to sign up for Ticketmaster 20 years earlier and get the verification code they sent.
There are a lot of reasons to dislike digital tickets, but this is one of them. I used to go to dozens of concerts every year. Now it's such a hassle that I don't bother unless it's small venue that doesn't play these games.