What feng shui is exquisite on the threshold?

In the past, we paid attention to the high threshold to prevent money and water from flowing out, so we went to visit the rich man's compound, and the threshold was very high.

But now I don't pay attention to these. Because rich people buy cars, the countryside is often used as a garage, and even the threshold is saved. This is a social trend, for example, big cities pay attention to barrier-free roads to facilitate the passage of disabled people, which is the progress of the times and civilization.