I agree. What the novels did was expand on the same conflicts Luke was having at the end of ROTJ. I think because Lucas wanted to end Luke's story at ROTJ, he was implying that Luke had FINALLY come to some conclusion as to how to deal with these conflicts when he threw his saber away. It wasn't the only move a jedi could have made but all jedi are different, and Luke was at that moment establishing what sort of jedi he was going to be. The people writing the books realized that there could be more adventures with Luke, and they could throw him into different situations, and maybe he shouldn't have learned exactly everything about how a jedi should use the force just by facing his father. All that was very intelligent of them, cause it helped them get a closer representation to the Luke we all recognize. They had to kind of backpedal on things Lucas established at the end of ROTJ, and make Luke not quite so wise. I don't think GL's Luke would have ever turned to the darkside in Dark Empire, the way that Tom Veitch wrote it. But EU Luke might, because he was actually less wise and less of a jedi. But you're right, Luke didn't have a full grasp on how the force should be used when he was talking to Yoda. I think that's when Yoda's faith that the force would work through Luke to establish their goals would come in. I think it's notable that Yoda's faith in the force at that time should have been at an extreme high, because he had one foot inside the grave at the time. He was about ready to join the force. I think his words could be considered prophetic rather than academic.