I would assume that it's neither a UI issue nor a problem with the source data, but rather a limitation of the routing engine.
Looking at your link, it does seem to say that support is experimental.
Everything #OpenStreetMap related is welcome: software releases, showing of your work, questions about how to tag something, as long as it has to do with OpenStreetMap or OpenStreetMap-related software.
OpenStreetMap is a map of the world, created by people like you and free to use under an open license.
Join OpenStreetMap and start mapping: https://www.openstreetmap.org.
There are many communication channels about OSM, many organized around a certain country or region. Discover them on https://openstreetmap.community
https://mapcomplete.org is an easy-to-use website to view, edit and add points (such as shops, restaurants and others)
https://learnosm.org/en/ has a lot of information for beginners too.
I would assume that it's neither a UI issue nor a problem with the source data, but rather a limitation of the routing engine.
Looking at your link, it does seem to say that support is experimental.
yeah here is hoping that it comes along and becomes the default
I get "Metro Navigation in this region is not available yet" (region is Northern England, UK) from Organic Maps.
OSMand says "Unfortunately OsmAnd could not find a route suitable for your settings."
The Open Street Map website itself only gives foot, bicycle, car as possible options for directions.
I think the info just isn't there yet.