The vast majority of buses stop at the location of the physical bus stop sign, which is where the bus stop should be marked on the map, and where passengers would be waiting. All of the stop_positions marked on the map that I've seen in the Denver/Boulder area are simply on the road at the closest point to the bus stop, and so can be deduced automatically based on the location of the bus stop, so I don't think that including them in a route relation adds any detail.

Hello! As per the Wiki "marking the stop position adds no information whatsoever when it is placed on the road at the point closest to highway=bus_stop. In that case it can be abandoned". The stop_position tag is designed for places where the stopping location is distinct from where passengers wait. On this route, the bus always stops in the same place as the bus stop and so stop_position is superfluous.

public_transport=stop_position