When Tang Luo revealed his realm, his title changed from "boy" to "younger brother," even Ji Fu's attitude softened a bit, even willing to share one-tenth of his resources with the two of them.
This was not out of fear from Ji Fu, but respect and admiration.
The so-called Holy Land envoys are those who represent the holy lands and demonstrate their martial power. The thing they have in common is the ultimate strength in their current realms.
Young practitioners often choose to venture the world at the peak of their Transcendence. This is because they are the backbone of the world's practitioners. Selecting a practitioner from the Fierce Realm would be deemed unreasonably highhanded. Besides, Heaven-level bloodline has too much impact on combat power, hence it would inevitably lose the essence of martial arts.