Stuff like how Kylo feels about Vader’s turn and the relationship between the Resistence and Republic is in the film. It’s just not spoonfed to the audience though things like R2 waking should have been fully explained because it was a giant plot convenience.
Point to where it’s hinted about Kylo’s feelings towards Vader and the Republic disarming 90% of their military and leading Leia to form the Resistance please.
EDIT:
Luke using a T-16 doesn’t fully explain how he was so good in a space battle. Flying an X-Wing is one thing flying in a dog fight is another.
I never argued that it was explained how he performed so well in a space battle. I was talking about his ability to fly an X-Wing in the first place despite not being part of the Rebels before recently. But I’ll get into his performance too.
A short conversation with Obi-Wan leads to the audience knowing that Luke has become an excellent pilot and Luke’s remarks on the T-16 being similar to the X-Wings and being able to hit ~2 meter Womp Rats on Tatooine alleviates the issue of the audience’s suspension of disbelief being broken during the Trench run. And as SilverWook said, Luke was in real danger during parts of the Trench Run, especially during the end where Vader was about to shoot him down. The only reason Luke is alive is because Han and Chewie came back, something which doesn’t break suspension of disbelief because Han and Chewie are seen becoming attached to Luke/Leia over the course of the film, Han coming back to help save their asses is very in character. It also should be mentioned that Tarkin and Vader were extremely cocky about the Death Star as shown in a few scenes so they didn’t take the Rebel forces as seriously as they should have. All of this helps bit by bit to strengthen the audience’s suspension of disbelief and Luke’s survival in the end.