The thing is that inflicting the kind of infrastructure damage North Korea took over the Star Wars Galaxy would take an incredible amount of effort. you would have to hit dozens, hundreds, or thousands of planets and once one side begins launching such a campaign the other side would have to be crazy if they didn't put massive defenses around likely targets which would be made easier by the fact the hardware would be manufactured at the area being defended. And the target of such a campaign would likely also set up hidden manufacturing centers, easy to do in an area as massive as the Star Wars galaxy. While these would take time to come online I doubt they would still be offline 30 years post Endor unless the campaign against infrastructure started very late in the gap between Return of the Jedi and The Force Awakens.
...all of which could be made canon due to a couple sentences within an opening crawl.
AFTER THREE DECADES OF CIVIL WAR, CIVILIZATION HAS SUFFERED. YET, DWINDLING FORCES ON BOTH SIDES OF THE CONFLICT CONTINUE TO STRIVE FOR VICTORY USING WHAT LITTLE RESOURCES THEY HAVE LEFT........
It's scifi fantasy. That's all it takes.