I wouldn't go as far as you have. Prophets do not always pass on everything they are told. God gave dominion over the earth to man. It is up to men and women what happens. We can summon either demons or angels. If we summon demons, that gives them the right to enter the world and to operate. If we summon angels, we are inviting the Power of God to manifest. That may not involve a prophet telling others.The answer can be found in this verse.
Amos 3:7
Surely the Lord GOD does nothing, Unless He reveals His secret to His servants the prophets.
God is still revealing secrets to the prophets today, the prophet's job is to pass what is revealed by God to the people. And it isn't always ear tickling news. ;)
Much of the time, the Power of God manifests by one of His servants using his tongue. If God speaks a Word through one of His servants, there is Power behind that Word which goes out into the world -- and will not return void. In a way, you can compare it to a physical sound at the appropriate pitch can make a glass vibrate and shatter. What is worth preserving is preserved and what is not worth preserving is shaken apart.
One man by himself can alter the whole world if God's Will is behind him and if God speaks a Word through his mouth. His words are spirit as Jesus' were; and what he speaks is not his own words.
Revelation 10:7 But in the days of the voice of the seventh angel, when he shall begin to sound, the mystery of God should be finished, as he hath declared to his servants the prophets.
Some prophets, I think, understood mysteries they did not try to explain. It was enough that they allowed God to move through them -- some without understanding everything, some with understanding more.
How the Word, once spoken, interacts with the physical world might be hard to explain; but it can interact. Thus we see Jesus "speaking" and the wind calms down. Speaking is mentioned here too:
Matthew 21:21 Jesus answered and said unto them, Verily I say unto you, If ye have faith, and doubt not, ye shall not only do this which is done to the fig tree, but also if ye shall say unto this mountain, Be thou removed, and be thou cast into the sea; it shall be done.
There are different "types" of Words. Call them "voices" or "trumps" if you want. They were present in Eden and we see them again in Revelation.