[Evangelical]

If a person doesn't understand local church boundaries how can they know the difference between the books of the bible? They might think the book of Corinthians was written to the Romans and the book of Acts was written to the Egyptians.

Every time a person reads the New Testament eg read the book of Corinthians then the book of Ephesians they are using local church boundaries whether they are aware of it or not.

Without boundaries we might say that the Romans had a problem with female preachers and the Corinthians had a problem with keeping the law. What does it matter as they are all Christians, "Jesus is the boundary"?

Everyone knows when you write a letter to someone you put their proper address. You can't just put the address as anything you want and hope it gets there. To say the bible or the early church does not have practical boundaries is like saying it doesn't matter what address I put on a letter.

To say "It doesn't matter what you call yourself or what the boundary lines of the city are. If Jesus is in your midst then you are the Body and if not you aren't."
is like saying a "letter either has a stamp or it doesn't", and "every letter has a stamp, so it doesn't matter what address you put".

While it is true that a letter must have a stamp, it is not very practical to put any address you like on the letter and think you can just because it is a letter with a stamp.