If I'm team evil and I see a global echo alerting me that someone from team good just made hero, I'm going to have a pretty good idea where to track them down and kill them with my four friends. Sure, I could just spam who pk and notice that they just made it to 51, but that requires action on my part. Not a handwritten note saying: "So and so's out ranking and probably open to an attack." Same for team good vs. team evil.