OsmAnd is my family’s go-to app for navigation. I didn’t notice it missing information compared to Google Maps. The opposite really, with several hiking trails or small side-roads not being on Google some years ago. The only issue it has is navigation for more than ~200km at a time. Often, it just times out if you try that. That’s why Google Maps is still installed on some devices.
I haven’t added anything actively. I think I might have enabled an option to send location data to improve the accuracy of the streets or something at some point, but I’m very unsure about that one.