Why didn't China's six geomantic cities succeed in Langzhong?

Langzhong's geomantic omen should be analyzed from the perspective of China and Sichuan as a whole. Ancient geomantic omen likes it here, and Yuan Tiangang and Li study geomantic omen and practice. In this way, the Tiangong was built. Langzhong geographical situation, the whole Langzhong Jincheng is surrounded by water, surrounded by mountains, and there are many expensive devices. The ancient city buildings preserved so far are rare. So my city card is Feng Shui City. But it is estimated that there are very few people who really understand Feng Shui!