I understand the motivation behind the NTSB recommendation, but think I net out siding with the app developers here. The last time I checked, the overwhelming majority of active at-grade rail crossings are well-marked (and usually controlled by lights/gates in populated areas). Adding potentially confusing clutter to apps feels like it may in fact compound the problem if people mistake the tracks for roads/intersections.

Obviously, if apps are routing people down rail tracks, that's a big problem, but it doesn't seem to have been what happened here. Expecting developers to try to solve for every possible dumb human scenario doesn't end well.