What I've learned from reading this fun thread is that I'm apparently the only person in the world still keeping a paper logbook.
I do it because I enjoy reflecting on the dives as I lounge around in the room with a cerveza after all the gear rinsing is done for the day. And it is fun to go back through and remember all the people I've dived with over the years.
I've only been asked to see it once outside of a training class. That was from an insta-buddy from England who wanted to put his verification stamp on my log page. I didn't even know that was a thing, and it's never happened since. Other than 2 instructors, he's the only one that ever 'signed' one of my log pages!