In the book’s Hanafi terminology, labeling an act fard or wajib depends on the evidentiary basis. Importance, popularity, or practical benefit alone does not confer either technical category.
A faulty argument says, “This act is very beneficial; therefore it is fard.” It turns benefit into legal proof. An opposite error assumes wajib is optional merely because the term differs from fard. Examine the applicable evidence, its degree, and the school’s technical classification.