It's solipsistic anthropocentrism, is what it is. All symbols can only ever point back to human, either to structures of our mind to which is ascribed some degree of ''universality'' or else to contingent social conditions or indeed to personal experience. So when people now read even the first SH they read into it only personal motivations, repressions, guilt etc. All one encounters is a symbol pointing exclusively to character's interiority, not a bridge between in and that which transcends it. Yet we are finite beings in the world which transcends us in all directions and dimensions, we are creative only ever as first responding to what is given us. That's even in the etymology of symbol, that it is a meeting, that it points in two ways, not just towards us. And SH1 did this excellently, there is the interior but what the character experiences can by no means be reduced to interior without residue. Rather there are forces and agents beyond the human, experienced as refracted thru his interiority.
BTW, it's not just SH2 that is guilty of this reduction. Look at the first Alien vs the Prometheus. In the former you've an encounter with something that horrifyingly transcends the human, in the latter all is reduced to human. Taken together with Covenant you've a closed humanistic cycle of human overcoming the human overcoming the human ad infinitum towards more human. It's humans all the way down.