Im talking in the movie we don't get to see any of that success,
Republic Capital is destroyed in its only 5-10 second scene.
Luke's Jedi group is shown already dead in a 5 second scene.
You're getting a movie every year from now on. About 10 comics every month. About two dozen books a year. And, no doubt, multiple TV shows and video games.
Movie came out last week.
If you want backstory, don't worry, you're getting it.
Did we need this movie to explain everything that's happened in the past 32 years in the 2 hours and 15 minutes it ran for? Nope. 32 years have passed and 32 years of shit happened before the movie starts, you're not going to get all the answers in one movie, nor would you want to, I believe.