I think the purpose is to export the route to GPX, so that you can use it on your phone when you're cycling.

Yeah, that's fair. I just don't have a habit of doing that so for me the GPX thing while good is a change in behaviour that limits me from adopting this app / exploring new trails. Also on further thought, i could see myself wanting to change the route mid-journey and that would be another issue with only having the GPX file.