Really needs to be noted in this article that the custom route feature is NOT specific to walking/hiking. It also applies for driving routes as well where it is VASTLY more useful and more widely appreciated.
Not sure why this was written as if it was specific to the hiking feature. C’mon macrumors editors!!
Right now it is implemented in a really weird way. If I select a final destination (“A”), AM finds it, then I choose “Custom Route” from the “Plus” menu and add a point I would like the route to pass through (“B”), then the AM creates a route between the points A and B, not considering my current location (“C”) at all. To make things more complicated, it would route me from A to B, so I would need to change the routing directions. Super messy!