Well the Prequels actually showed us the galaxy and how it worked before the Empire, in terms of world-building the Prequels were far more ambitious than TFA and TLJ.
It wasn't super deep but it was a bit more than just "Here are the good guys. Here are the bad guys. Now watch them fight". We didn't get any real world-building in the OT or the ST (Sequel Trilogy) outside of a few lines dialogue here and there.
I'm not saying the PT was any good mind you, the only not horrible one is RotS and even that one is barely above mediocre.
Ehhh even that is superficial at best for me. They introduce the Trade Federation, but never explain what they actually do, or why blockading planets illegally makes sense.
They introduce Separatists and a Civil War, but never explain why they exist. Just that they do, and robots bad, clones good...maybe? Then of course it knocks down any idea of grey by making the Emperor behind it all.
We are the Jedi, but they are nothing more then celibate monks who sit around and wave light swords around. We never deep dive into the dogma and why it might be flawed. Movies only toy with that idea on a very superficial level, and then toss it aside back to black and white morality.
So yeah it did introduce new locations and parts of the world only previously mentioned in title crawls, but nothing was actually built. It was all just there. We just filled the gaps in with our head canon, or with all the EU stuff that flooded the market. So in the end it was no better then “here are good guys, here are bad guys, fight”
I guess the larger point is all 8 of these movies are really rather shallow. Which honestly can be fine. It worked great for the OT. I think it was fine for TFW too. I guess the prequels tried to be a bit deeper and more ambitious, but it was done so lazily that it just created a shit pile. TLJ tried to do it a bit too with the galaxy abandoning the resistance, and introducing an industrial military complex, but it was all ham/fisted and shoddy that it doesn’t work either.
The new trilogies big problem to me seems to be it doesn’t know what it wants to do. Does it want to play it safe? Does it want to do something new? No one seems to know, because it is obvious there was no plan put forth before filming began.