This feature now seems as an aspirant to "most useless feature" now. But I can imagine correlation to "I am familiar with the star players, and am not afraid that they will be transferred" in Fun survey or something else.
After reading BB-Charles update and looking at my players roles all I could think was.....interesting, but what is the point?
After reading this post to see if there was one the above response was the best I could come up with. Also mentioned was easier quick scouting, but I think this would be more misleading than actually looking at the player card to see exactly how he is used. Also maybe an effect on salary rollover? Hmmmm.
Maybe in season 16 they could add a new skill called 'Media Skill", where we can see how savvy our players are with the media.....but not be told what this new skill actually effects. Some people will know of course, and they can make adjustments while the rest try and figure it out.