Why would the
evolution of dynasties play such an important role in Chinese history?

Each new dynasty meant new improvements and modernization. Take, for example, the most famous ones of all. The great wall of China was built between dozens of dynasties, one of China's greatest achievements. Another one is the silk road. It brought the country flourishing trade and wealth. Each dynasty means something new and beneficial in many ways.  These were religious, political, civil, and sometimes military improvements. The wisdom from these ideas came from only just a small handful of dynasties. They play an important role because it shows their origins, successes, failures and ideas. It also shows how China was built up to how it is now.