The point is, if one can easily bop from Core Worlds to Outer Rim ones in a day or less, than notions of planetary remoteness and geographic distinctions are pretty much meaningless.
Uhh... Welcome to Earth. We have jet planes that can get you anywhere on Earth in less than a day, but there are still plenty of places on Earth that are remote and undeveloped. It's not a question of travel time, it's a question of where people prefer to live and put their resources into developing. That's not going to be evenly distributed or proportional to distance. I can leave my city and drive 100 miles up I-71 and reach an even bigger city, but most of the places in between those two cities are more sparsely populated and more rural.
And, if Disney is determined to prettily dance around clarifying what the Empire/FO actually stands for, if not human supremacy, than the whole franchise is really not about anything, beyond "bad guys bad, good guys good," and probably never will be.
What, being against totalitarianism and genocide doesn't count as being about something? Of course it's always been a pretty straightforward good-vs.-evil adventure story for kids, as JD says, but the Empire is pretty obviously based on the Nazis, and the whole thing has a consistent anti-fascist stance.