That's one of the things that bothered me about Star Wars from the very beginning, actually: it did a crappy job of worldbuilding. It was George Lucas's style of storytelling... just throw a lot of characters and places and concepts at you, without explanation or even names sometimes, and expect you to take it all at face value.
The new Disney SW material is just continuing that style, except it's even worse in some ways because the new stuff seems to be in conflict with stuff we thought we understood as of the end of the original trilogy.
In a lot of ways SW was a precursor to some of modern Hollywood's worst "blockbuster" storytelling tropes, which basically use the minimum necessary narrative thread to stitch together big action set-pieces. That never did much for me. Obviously it satisfies a lot of people, though, so de gustibus...
Funny thing is: George Lucas actually did that
on purpose.
He was a big fan of foreign films - specifically Japanese (Kurosawa's Samurai movies being chief among them), but also French, Italian, classic German ones....
Here's the thing: All these movies depended a LOT on cultural context of each country - which Lucas simply didn't knew. He was bombarded with references to things and backstories that were never explained - German fables, Japanese history he knew nothing about - and
liked it. For him, he felt, it enriched the films, gave them better "worldbuilding" than if everything would have been
explained by dialoge, and basically made the experience
better, as long as he was still able to follow the main narrative.
Believe it or not: George Lucas wanted Star Wars to emulate the feeling of watching foreign movies.
Especially, he wanted to create a foreign movie
from another galaxy, not an "American" movie
about another galaxy. That's why he threw concepts and backstories at the audience without ever explaining it - the "clone wars", the sudden Obi-Wan-gives-Luke-a-lightsaber scene out of nowhere (reminiscent of old Samurai movies). He just expected audiences to pick up what everything means or if it's important by how the characters react and treat those things. And IMO he 100% succeeded. It's a way better way to create a world than explain every single detail. YMMV of course.
(J.J. Abrams not explaining shit in Force Awakens - like what happened to the old Republic - was just lazy though. That's not "backstory". That was vital information important for the plot of the movie, that was just plain left out on the cutting floor to have a faster pace. Thing is, you don't
neeeed to know what "the Clone War" was to appreciate "Star Wars". But you sure as hell need to know what happened to the New Republic - It was the main contribution of our old heroes to the universe! And it just... disappeared?)