The obvious point, lost, ignored, even denied by many pseudo-traditionalists is that the liturgy is about "God and human".  It is all about perpetuating the Incarnation - becoming flesh - that renders God visible, humanly lovable by humanity as human. 
If its "about God and not about man", it is not even Old Testament, it would be "non-human" or more precisely "inhuman", therefore not "liturgy" at all, at all.