More likely, they simply have yet to find a competent professional they trust who has simplified their life. Competent professionals are thorough. Audio taping conveys competence. An incompetent professional would never create a permanent record of their incompetence on audio tape. Conversely, a thorough, competent professional would naturally record the conversation so they could refer to it to do the best job possible for the client.
Competent professionals are obsessively thorough.
Competent professionals are familiar and comfortable with all the necessary documents. Your clients will be impressed by how well you handle the necessary documents. Rather than fumble and look foolish in front of the client, be prepared to handle the documents effectively. It increases their confidence and yours. Competent professionals know how to handle the documents.