I mean, I am "pro-FOSS", but I use OSM when walking and cycling because it's simply the best data source out there. I've used it all over the world from the Peak District, to European cities, to remotest South Africa.
Osmand is great but maybe you should consider that there is no one app to solve all of your problems, especially given that you've already accepted that OSM is data, not an app. There's Osmand for outdoors kind of stuff, maps.me for a simpler, slicker Google maps like experience, Graph Hopper for advanced routing and planning, cycle.travel and others for cycling, hike maps, transport maps, the list goes on.
Osmand is great but maybe you should consider that there is no one app to solve all of your problems, especially given that you've already accepted that OSM is data, not an app. There's Osmand for outdoors kind of stuff, maps.me for a simpler, slicker Google maps like experience, Graph Hopper for advanced routing and planning, cycle.travel and others for cycling, hike maps, transport maps, the list goes on.