IMO, for what it is worth, if a church is universal then it stands to reason its doctrines should be universal. Therefore, the readings etc. should be universal.But if different churches have different agendas, then it cannot be universal.
When Jesus and the early Christians were on the earth, they did not have different agendas. Jesus told his followers to preach the good news of God's Kingdom, to make disciples and teach them what Jesus had taught.
Today, most churches have become divided, if they don't like something then they split off and form another denomination. This happens again and again. Thus we have so many various forms of Catholicism, Anglican etc.
Yet in your heart you know that there must be more to Christianity than that. You know from the Bible that the very first Christians made up a happy, united spiritual family.
The fragmentation did not begin until after the last of the apostles died, then people began to form their own little groups and cliques.
Is there any church today that is totally united?