Wow, I use a pen nearly every day. Sometimes I deliberately get a pen or pencil and paper rather than a phone. I was doing some home improvements in my attic, and I would often need to jot down a measurement so I could cut wood etc. I did this once or twice on my phone and realized it's much easier to do this with a pencil and small notepad.

In what is perhaps the most ironic blend of high and low tech, I wrote my own software to build grocery lists, which I then print and use a pen to cross items off as I shop. This is by far the most efficient vs trying to faff about with some mobile solution.

Apple Reminders has native grocery lists now. The collaboration feature (a household can keep just one shared grocery list) and auto-categorizing by store section are serious time and frustration savers. No "oh shit, I left the list at home", no "I could go to the grocery store while I'm out, if we need anything... but the list's at home...", no manually organizing the list, no grocery-list-by-text. It's so nice, saves far more time than any faff it introduces (I'd agree that without the collaboration and auto-categorizing, grocery lists on phones would be more trouble than they're worth)

(I know other apps have also done it, but having it on a built-in is really handy and it works well)

I prefer an app for grocery lists since it can be managed with a single hand while shopping - no need to stop in the middle of an aisle to pull out a pencil and cross something off, nor to print anything out before heading to the store, for that matter. Plus, I won't have to re-sync the list with what remain on the physical list at the end of the trip.