The label furūʿ (branches) indicates that detailed rulings governing worship and transactions are connected to more foundational principles and legal evidence. It does not mean that practical obligations are insignificant.
The label ʿamaliyyah (practical) emphasizes how actions are required, prohibited, valid or invalid. The two designations illuminate different aspects of much the same domain.
For example, prayer's obligation is also an object of belief; questions concerning its times, prerequisites and performance belong to detailed jurisprudence. The classification follows the particular question being asked, not an absolute separation of prayer from faith.