As the first dynasty that really entered the feudal society, Qin made China enter the feudal period more than one thousand years earlier than Europe. During the Warring States Period, Shang Yang's political reform made the State of Qin from weak to strong, which laid the foundation for Qin Shihuang to unite with the six countries. The death of legalists in the Qin Dynasty is out of the question. Legalists and Confucianists both emphasize that monarchical power and the principle of monarch and minister are their ultimate way to govern the country. Centralization is the symbol of feudal society, and the monarch is always above the law, which is an indisputable fact in China feudal society. What's called "the Emperor breaks the law, but Shu Ren is guilty of the same crime" is just a public opinion of governing the people. Legalists played a role in promoting social progress in the Qin Dynasty. Confucianism teaches people to obey the monarch and be loyal to him like heaven, while Taoism says to govern the country according to God's will. Legalists, on the other hand, are different. In the Qin dynasty, it was always just a code of conduct for a society that had just entered a new era, and it was the emperor's suggestion to measure his subjects. Whether to adopt it or not is entirely up to the emperor and the lawless. I can only understand that the temperament of the first emperor in the history of China ruined his country, and his bloodthirsty and arrogance made him not get a good evaluation in the history of China.
During the Qin Dynasty, centralization was not perfect. By the time of Emperor Wu of the Han Dynasty, centralization was truly completed. If Qin Shihuang really looks like Hitler, there is no need for him to split the army in two after reunification. Defending the Great Wall and defending the Xiongnu in the north respectively, there are 500,000 troops on the southwest border of Qin. So that when Xiang Yu approached Xianyang, he could rely on the old, weak and disabled soldiers and some guards to fight.