Sorry I am not communicating well. I am trying to understand what you were saying about how the words/teaching of Jesus, once potentially passed down in ignorance, became what we would call ‘doctrines’ or ‘truths’. You used as an example ‘breaking bread’. From what I understood, this was a teaching that was passed along but not fully understood until a later date?
We have practises that have always been even though some may not have understood the why, but we have learnt it from the Apostles who learnt it from Christ
The last supper -- we celebrate it each week on a Sunday. Why? Some groups say this should be on a Saturday, some say it should be only once a year.
Ask someone in the 4th century say in southern Gaul why they worshipped on Sunday each week instead of only once a year on Pentecost and a few would not be able to answer you exactly why, right?
Why, even now ask a bunch of Christians across denominations this and quite a few in each denomination will not be able to tell you why.
No individual, approved or not in any way can change the faith. To come tomorrow and say "gay marriage" is ok, it's a change is wrong.