It is already the case in many Australian Courts and tribunals E.g. NSW Supremen Court [1] here is another tribunal [2]. Not sure why you would not like the disclosure as to how a document, statement, etc was made when the author was not the individual signing their name and may not represent their words, knowledge, beliefs etc.

[1] https://supremecourt.nsw.gov.au/documents/Practice-and-Proce... [2] https://www.pi.nsw.gov.au/resources/procedural-directions/pr...