The sum of all church history.
On post #16, I stated that in the historic confessions, protestants agree far more than they disagree. Interpreting scripture is not rocket science - unless you want it to say something aside from what is obvously written.
Protestant history began 500 years ago with a human founder, it has no history before that. Since then they have divided into every subjective human interpretation of scripture.
Before that the was The Catholic Church which canonised the Bible in the first place.
If Protestantism was correct and Luther was inspired in his new Bible alone idea, it would have been ratified manifestly by heaven so that all who read the Bible would have arrived perfectly with Luther’s interpretations and doctrines of scripture on reading it.
What Luther thought obvious in scriptures meaning was suddenly dog piled by everyone’s subjective interpretation in conflict with “ inspired “ old Luther.
It was each man’s subjective interpretation, a matter of each man’s fallible opinion.
Under Catholicism, the scriptures had a singular Apostolic objective interpretation going back to the Apostles.
Catholics still maintain the same traditional interpretation of scripture.
Protestantism founded every new conflicting human tradition, interpreting any doctrine they wanted.
I can go to an Astros game at Minute Maid park and hear the entire stadium shout "GO ASTROS!" and this is pretty much what John is stating here in the passage you have cited. In a large room with mixed conversation, I have difficulty distinguishing one conversation from another and it only gets worse as I get older.
It has nothing to do with the limitations of earth but with the limitations of our finite, human nature. Only God possesses the attributes of omniscience, omnipotence, and omnipresence. We will never have these attributes even in our final, glorified state.
It doesn’t say they were all gathered in a stadium or at one place. That’s your human rationalisations.
It says they were in heaven, on earth, under the earth, on the sea and in the sea.
Clearly God granted John the ability to hear them all where they were.