Lord Haseo said:
All Luke did with the exception of shooting a few Storm Troopers and blowing up Tie Fighters was a brief practice session with that droid. Going from that to blowing up the Death Star is pretty jarring.But he didn’t kick Vader’s ass. He didn’t overcome Vader’s force powers. There was nothing inconsistent in the original Star Wars film as far as the ending goes.
You’re missing the point. Luke blowing up the Death Star shouldn’t have happened. Rey beating Kylo Ren probably shouldn’t have happened too BUT there are at least two reasons which at least partially explain why she was even able to survive. Luke blowing up the Death Star happens just because he’s special just like Rey beat Kylo Ren because she’s special.
90% of the story was spent building up Luke’s character. He was just a farm boy nobody. He gets thrown into a wall in the Cantina. He gets blasted by the bot over and over again. He’s a whiner.
Then suddenly, he uses The Force for the first time, and he blocks the blaster bolts. Then he’s daring and brave and courageous rescuing Leia in the Death Star. Then he’s shooting down storm troopers. Then he’s blowing up TIE fighters aboard the Falcon.
Finally, at the end, he pilots his X-wing into the Death Star trench. He would have been killed by Vader had Han not come back and saved him. That bought Luke just enough time to get off his shot.
Sure they built Luke’s character up a bit but there as nothing that was shown in the film that showed he had the kind of potential to blow up the Death Star which was established to be a shot so hard targeting computers in a Universe where interstellar travel is possible wasn’t even accurate enough to blow the thing up. Especially seeing as how he’s never flown a X-Wing. Also Biggs can shut the hell up.