My buddy Dave down in Chillicothe had almost the same thing happen last summer. He ran everything off his phone too, and when a storm knocked his power out for 5 days he missed his truck payment and got hit with a 40 dollar late fee. After that he stapled a plain calendar to the wall in his garage and writes each bill on its due date. He told me the same thing you did, that actually scribbling over a paid bill with a marker does something tapping a screen never did for him. He's been doing it almost a year now and says he's caught two bills he forgot he even had. Paper just makes you look at it different I guess.

Kept a folder of old recipes for years for the same reason. My grandma's cornbread had three versions in her recipe box and she wrote notes in the margins like "too dry, add more milk" or "this one for holidays." Sound familiar? People have been versioning things forever, whether it's sourdough starters passed down with little tweaks written on index cards or grandpa's fishing spots marked up on a paper map. The tool changes but the habit is old as dirt. You're basically doing what cooks and woodworkers have done for generations, just with prompts instead of flour.