Often when you are learning from the Risen Lord it is difficult to hear. It is very difficult to be in a physical body and stay connected at the level of the Risen Lord.
Jesus is there all the time for us equally. All it takes is one stumble and you are off the station and can’t hear the music. It’s a constant struggle to stay tuned in. (the concept of rapture is merely being raised up to the level of connection)
When we are not tuned in, our personal bias and unresolved conflicts get injected into the message. That has happened to Paul. That does not take away from his greatness or the wonderful wisdom he conveyed to us through his letters.
Paul got his instruction from the risen Christ. His writings were inspired by the Holy Spirit, any 'bias' in them was a result of that inspiration. Or is God subject to man in that He can prompt, but man makes the final decision on what is written?