Since Justin Martyr devoted a chapter of his Apology to the matter, and placed it in sequence with what the service was, he certainly believed it was an integral part of the service.
The author of the OP purports to "get back to the ancient church." He gets back to something; but it's not to the church that Justin Martyr was writing about.
No. Priesthood , no mass
But what IS the church Justin Martyr speaks of???
Most of his works are lost, but two apologies and a dialogue did survive. The First Apology, his most well known text, passionately defends the morality of the Christian life, and provides various ethical and philosophical arguments to convince the Roman emperor, Antoninus, to abandon the persecution of the fledgling sect.
Further, he also makes the theologically-innovative suggestion that the "seeds of Christianity" (manifestations of the Logos acting in history) actually predated Christ's incarnation. This notion allows him to claim many historical Greek philosophers (including Socrates and Plato), in whose works he was well studied, as unknowing Christians.
That makes sense since your religion is built almost exclusively on human philosophy and not actual scripture...