I agree that the way the early church spoke about, to and related to Jesus is different than JWs. Isn’t this mostly accounted for by the fact that many in the early church knew Jesus personally or had an encounter with the resurrected Jesus as Paul did? For example Stephen spoke directly to God and Jesus when he saw them in a vision. I dare say if a JW saw Jesus at the right hand of God they would have no problem speaking to him and addressing him Lord too.
The JW practice of addressing songs and prayers to the Father does seem to follow the biblical pattern and instruction.