Why was al-Razi concerned about previous scholars studies of smallpox?

Al-Razi was concerned about previous scholars' studies of smallpox because he believed they lacked empirical observation and relied too heavily on ancient texts without critical evaluation. He emphasized the importance of firsthand clinical experience and systematic observation in understanding diseases. Al-Razi sought to provide a more reliable and accurate understanding of smallpox, aiming to improve diagnosis and treatment by challenging established notions and advocating for a more scientific approach to medicine.