I'm a OSMand user and OSM contributor. However, sometimes I hate the routing OSMand provides, taking me through narrow streets with awkward turns. Wish they used GraphHopper...
A nice feature in OSMand is that even if you get the free version off the Play store, if you log in with OSM and are active, you get free map updates and all the "plus" functions. And on top of that, the full plus version is available off F-Droid.
By the way, OSMand has some support for reporting traffic issues (police, crashes), but it's very very limited due to low adoption way below a critical mass. Also, reporting traffic status would probably require OSMand to run a pretty beefy server and get the current speed/traffic info from all the users - many chose it exactly because they don't want that.