Exactly. It's the contrast between all the things human (cord, blood water, placenta) that accompanies a normal human birth and the theology of e-v (Christ as phantom, Mary as channel, still in the puerperal state, birth from her side/east gate).
The idea that the belief is the same as the Church taught from the very beginning remains without substantiation. The miraculous virginity of Mary was an accepted belief from the very beginning. The Ever-virginity of Mary was nowhere to be found in the earliest discussions.
So rather than constant teaching on this, there was controversy. Christians like Origen and the Gnostics as well, were only too glad to accept the ideas of the pseudo epigraphia as true accounts of the birth, while others like Tertullian disagreed vehemently. What emerged was an official church that held onto the EV concept, while rejecting the phantom birth that was at the source of the EV theology in the first place.
At the same time, the Tertullian insistence on the full humanity of Jesus was accepted, while the underlying logic behind this fully human concept, of a normal human birth, and family with brothers and sisters, was rejected.
The idea that "we have the church fathers" while "you only have your opinions" is patently false. The Church fathers simply were not all saying the same things. People arising from the same bishopric as James, such as Cyril, most certainly understood that James was a real brother of Christ, like Aaron and Moses. Others not so familiar with who James was, such as Origen, were more open to false accounts of the life of James as first born, and thereby saw PoJ as authentic.
Virgin Mary was the teaching from the very beginning, and apostolic, such as legitimate apostolic works such as Scripture very clearly and unequivocally inform us. Ever-virgin Mary was taught only from a later date. If pseudoepigraphia like PoJ and Peter were not the sole source of this theology, it is the only source that is known.
Stating the truth plainly is only harassment for those who have fallen in love with the fiction.