OK, very clear thanks. This is the gray area that can become very sensitive sometimes: the difference between "virtual routes" and "signposted routes", which can lead to a significant amount of friction on the ground (commercial interests, private properties, etc). The current consensus in the OSM Outdoors community in France is to take advantage of the general consistency between "observable on the ground" and "sanctioned by local authorities", and not map "virtual routes" except when they are very obviously supported by local authorities.
Thanks again!