It had more off-road trails than I had ever seen on Google Maps, along with altitude information, lodge reviews, checkpoints, etc.
I vividly remember turning my phone on a couple of times a day to look at MAPS.ME before immediately turning it off to save battery (you can't easily charge your phone up there). Except for the camera, I basically haven't used any other app for a whole 16 days. I haven't experienced such digital minimalism in adulthood until and since this trip.