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Yoda told Luke at the end of Empire that if he abandons his training to confront Vader then he'd turn to the dark side. I think they're going to at least address that.
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Confronting Vader and not being turned to the Dark Side was part of his training.
You must confront Vader. Then, only then, a Jedi will you be. And confront him you will.
Also
“If you end your training now — if you choose the quick and easy path as Vader did — you will become an agent of evil.”
Admittedly I had to look this up. But Luke didn't choose the quick and easy path to destroy Vader. And when he was offered to be at Vader's side. He refused even though the only other option was certain death by falling off Cloud City.
I will say Luke definitely had Dark Side tendencies. In Jabba's palace. He had that full dark robe has force chocked the guards. And he lashes out with anger when Vader found out that he has a sister. All of which he realizes after he notices Vader's missing hand and compared it to his. He was turning into just another Vader. And he stopped himself, refused the Dark Side and in-braced the Light (As well as a lot of electricity).