The purpose was to show the contrast between the Traditional Mass - “The Mass of the Saints” - and “a fabrication, a banal on-the-spot product”.
Cardinal Ratzinger: "J.A. Jungmann, one of the truly great liturgists of our time, defined the liturgy of his day, such as it could be understood in the light of historical research, as a ‘liturgy which is the fruit of development… What happened after the Council was something else entirely: in the place of the liturgy as the fruit of development came fabricated liturgy. We abandoned the organic, living process of growth and development over centuries, and replaced it, as in a manufacturing process, with a fabrication, a banal on-the-spot product".