I discovered that recently, it's a very fun way to contribute to OpenStreetMap, and the UI is really well-done, it's totally beginner friendly! I wish there was a way to do more than labeling though, like add simple roads and footpaths

I have used it one (1) time in my life, ans it was my first experience with OpenStreetMap in general. It was pretty fun!

It's very intuitive and makes you learn just how detailed and specific map data can be. Can't say much about missing features since I don't event know what can be done.

Recommended experience, it's like playing Pokemon Go without the evil part :)

Usually if I need to add a footpath I use the "Create new track recording" feature to trace out the path with GPS, then come back to it later on desktop. Adding paths is pretty awkward to do on mobile, especially since there's no satellite overlay.