Shi Lang didn't have the time to pay attention to the whole world, he was focused on his cultivation and guiding the people around him. He was not selfless, he didn't release this information to the people, because they had established their own ties and were seeking benefits from those alliances.
While Asura Hall had connection with the people of the sage races, the rest of the people had come in contact with the so called fallen races. These races didn't have any saints in their plains but they did have the legacy left behind by the saints that came through. In exchange of spiritual resources, the information was exchanged.
The human realm was thriving and the skirmishes around the Dao Plain intersections have reduced. The myriad races were now using legitimate means to come through the portal connections and train the youth of their races. They didn't send the absolute best of their youth to the unfamiliar territories but that was not the case with Asura Hall.
