After riding in Eifel for three days, I can only agree. Navigation Next did not miss a single waypoint. It used "traffic aware routing" to avoid road closures on multiple occasion (the amount of road maintenance in Eifel is still exorbitant btw...).
In my opinion there a few priority things to improve
Audio ducking does not seem to work on Android, and the voice is not loud enough compared to music.
Traffic aware routing is great, but it would be nice to get notifications about it.
Downloading offline maps and updates still need to improve
And for some obviously the battery drain is an issue. Personally I doný have that problem.