In my opinion it would really be a great improvement to be able to change the names of the waypoints in my route. It’s OK to have all those “via point xx” by default, but certain waypoint on a route often have a special significance. For example because there’s a restaurant with a planned stop, a parking lot to meet other buddies or a certain location to be visited.
It’s sometimes quite confusing to have a good overview over your route without the possibily to have custom names for your waypoints.
And of course it should be possible to keep the names of an imported GPX-file. Quite often imported routes are planned with another tool (like Garmin Basecamp or the MyRoute-app platform), and some waypoints have significant names to be better recognized while being on tour.
I would even go one step further and provide the option to choose special colours for waypoints. So it would be much, much easier to identify special waypoints on your route when switching from navigation mode view to normal map view while being on the road. Simple thing, great effect.
Have fun and ride safe!