My opinion: it would be better not to have overlapping sections.
But please remember that we probably need two GPX files for each section, one for each direction. There’s the problem with one way streets i.e. at Arzviller
By the way I’m surprised at the work done these last hours. There were some problems at the german part of EV 3 but that’s fixed now and one part of EV5 where GPX is wrong and OSM is right is now a separate section, at Gondrexange. You won’t cycle on the left side of the Canal du Marne au Rhin there
even if with some types of bicycle it won’t be easy to cross the bridge over the canal:
