Why did seal cutting in Qin dynasty mainly focus on small seal cutting?

Because the Qin Dynasty was still in the Bronze Age, the ironware was not very developed. Therefore, in the use of tools, bronze ware with mature technology is still the mainstay. The unified script of the Qin Dynasty is the Qin script "Da Zhuan", but Xiao Zhuan is still very popular among the people. It was not until Daxing imperial academy in the Han Dynasty that official script spread to the people. It was also the Qin Dynasty that made few achievements in education.