What is the reason there is no one to undertake the critique of the chains of transmission (asanid) of modern Islamic law books that were compiled by hearing from scholars, even though the transmission of chains of transmission extends to our present day?

The authentication of religious books transmitted across generations often does not require critique of their chains of transmission (Isnad), due to the certainty of the book's attribution to its author and the accuracy of the relied-upon copy. Al-Wajadah, which is the acquisition of knowledge from a written source without hearing or authorization (Ijazah), is a valid and accepted method of bearing knowledge. Its use has become essential in later eras after the spread of printing, such that if reliance on it were to cease in favor of mere narration, the door to acting upon transmitted knowledge would be closed due to the impossibility of the condition of narration. Ibn Kathir adduced as proof for acting upon al-Wajadah the Hadith: "A people will come after you who will find scriptures and believe in them." These books suffice to be transmitted by al-Wajadah, and there is no need to critique their chains of transmission connected to the authors, because their attribution to them is known and certain. The rulings are based on the Ahadith contained within these books, and these Ahadith have already received their share of critique and authentication.