The grotto heaven was now undergoing an upgrade, with the world in a state of upheaval, constantly destroying and then regenerating.
Even if he didn't destroy the Spiritual Beauty location, this place might reset; it might birth new spiritual beauties or vanish entirely.
If someone with ill intentions targeted him or the people around him, leaving it as is would only benefit the enemy.
As for handing it over? Zhao Xing had previously obtained a batch of "thousand-year-old ice crystals" and didn't need to complete any more exploration tasks in the short term. Additionally, turning in location information would be of little help in completing the exploration mission.
The Military Realm didn't require explorers to submit location information. Back during the Great Battle to Suppress the Barbarians, "intelligence" yielded the fewest battle merits; the principle was the same now—the Creation Plate could calculate the birth and death of any location.