He’s the one who requires that kind of track record for someone who claims to speak in His name and it’s got nothing to do with the sinlessness or perfection of the person speaking.
Jesus has not, nor has is father, made the claim his prophets are any different than you or I other than their calling by name from God himself and “Thus sayeth the Lord” from the lips of those called. That’s how it has been done from the beginning. It has not changed other than some people now believe there is no need for prophets, revelation, repentance Baptism, Authority from God, works, etc. contrary to the word of the Lord.
I suggest the need for prophets is greater now than at any time in the history of the earth. What makes you think otherwise.
Does the FACT that 'if what they say does NOT come to pass' even register with you?