Why did it take this long for SpaceX and NASA to share satellite location data?

NASA likes to launch things into space. SpaceX has many satellites orbiting Earth. You'd think that, since the two entities are so closely tied together with contracts and agreements, they'd have thought to share the locations of their various spacecraft with one another to avoid possible problems. Apparently, that hadn't happened yet, and the pair only recently shook hands on a Joint Spaceflight Safety Agreement that will allow NASA to map out the location of SpaceX's Starlink satellite horde i...