What is the difference between the science of virtues and the science of issues?

Some people wonder why the preachers of certain groups limit themselves to the science of virtues (ilm al-fada'il) and avoid delving into the science of rulings (ilm al-masa'il). These preachers believe that discussing jurisprudential issues, which are often a point of disagreement among followers of different legal schools within the same group, may lead to disunity. Therefore, they prefer to focus on the science of virtues, which everyone agrees upon. This includes prophetic texts that encourage acts of worship and good deeds, while the science of rulings refers to the jurisprudential rulings related to acts of worship and transactions.