The example set by the Early Church Fathers is of value for some things, but if you were to follow everything from them, it would have there be a lot more to change. You should then be vegan. That is actually a good way to change. Yet for believers nothing that was happening later is to take precedence over what is taught from the Bible. And the gospel of salvation through faith in coming to Jesus, that is with repentance to the harm from us and offences to Yahweh from us that there are, is shown repeatedly in the scriptures, without need of taking a transubstantiation of anything into Jesus being shown.
There is value in seeing symbolic meaning in places rather than absolutely everything being literal in scriptures, or even in anything else. There are not literal planks in any of our eyes, after all. The gospel is about Jesus' atonement for us which included him going to the cross, it was for us, and in the hours of that final day before this happened, it was clearly very much on the mind of Jesus. Since it was for any of us who would be his believers, he was saying his offering himself for them was that new covenant, that had been anticipated from Jeremiah 31, which has internal change for those in it, that he showed with the bread at his last meal with his disciples, and with the wine, as he had the offering of himself on his mind, not a new teaching that isn't mentioned elsewhere to give them right then, which wouldn't be what the prophesied new covenant would be about. If it thought somehow Jesus meant he transubstantiated the bread and the wine right there among his disciples into his own body and blood (which if it really happened I think would be really noticeable, but what I've seen for that being claimed never is), there is no basis at all from that to insist that priests in the church are having wafers of bread or any wine transubstantiated into any flesh or blood of Jesus.