I was recently talking to a friend who, like me, is from the age of the Original Trilogy before there were a lot of outside inputs. We were discussing communication and he reminded me that it seemed like only the Empire could communicate in real time across star systems. I did the head slap to myself and realized he was right. In the OT the setting was much more a Space Fantasy in many ways, so the characters are not communicating over interstellar distances by use of telecommunications.
If Interstellar real-time communications are the realm of Military/Government then information becomes more precious and messages and couriers are more pertinent. Pre-made rendezvous points are a thing that you need.
Fantasy games like D&D are often easier to run in many ways because there isn't this kind of communication normally.
It also seems to me that the Empire would not want open communications between systems.