Yi-ology and geomantic omen are widely used and have existed for thousands of years. With the improvement of people's living standards, more and more people realize the importance of forecasting and geomantic omen (referring to Hong Kong, Taiwan and developed coastal areas), which is a sunrise industry in Chinese mainland. In Southeast Asia and other countries, more people believe. South Korea even regards Feng Shui as a traditional knowledge in China, and even tries to get ahead of China people to apply for an inheritance.
Now some masters with real skills are still very popular, and some stars and rich people have to ask Mr. Feng Shui to build a mansion. Some masters are really as mysterious as you say, but there is a lot of knowledge in them. Some secrets can only be understood by truly skilled experts, and there are some technical contents that you can learn more about.