I mean, I lived through it. By 1986, we had three movies, the Holiday Special, the Ewoks and Droids cartoons, one novel (Splinter of the Mind's Eye), six novellas (the Han Solo and Lando Calrissian adventures), and one comic book series, plus the newspaper comics if one happened to live in an area that carried them (I didn't). Universe-building was thin on the ground.
When West End got the RPG license, everyone thought Star Wars was dead, and that was just going to be the fading playout -- a little bit of niche popularity among a subset of the population, and then fading interest until it was discontinued. So they had pretty much
carte blanche to make up stuff to fill in the holes -- and, unfortunately, also got a
lot of things wrong that got perpetuated into the card game and other media that followed as the Renaissance began in '91. Imperial ranks, what different uniforms meant, the "five-mile fallacy" for the Super Star Destroyer, how lightsabers work, and a bunch of other crap. Just saw
Rawktrooper mention over in the X-Wing pilot costume thread about the blue Rebel insignia on the background helmets in Star Wars. Except that's the crest of Alderaan. The "sliced onion" decal is the "Rebel" symbol -- though more likely the emblem of the Galactic Republic the Rebels are trying to restore.
But for all their misinterpretations, there's so, so much they added that's a solid contribution to the universe. We got Jodo Kast and Colonel Kracken and Storm Commandos out of it -- and, alas, also Imperial Inquisitors. Then we got X-Wing and Decipher's CCG and Heir to the Empire and Dark Empire and the '90s exploded with new Star Wars, and a lot of the heavy lifting those few early contributors did was lost in the noise, misinterpreted, or forgotten. Plus all-new misinterpretations based on the newer material. When Heir to the Empire came out, a lot of people thought the guy in the white uniform in the
Death Star conference room was a Grand Admiral, after Tim described the white uniform in Heir to the Empire. Except what Tim described was not that -- it was a new uniform not seen on film, a new class of Imperial officer than Our Heroes had run into before. And the guy in the conference room was not wearing it -- didn't have the gold epaulets, it was off-white rather than white-white, and it was a lighter-weight material in a different cut than the other officers' jackets. Plus, we saw him in the corridor later, with another individual in the same uniform -- both with black breeches and hats. But when Kenner released the
Death Star conference action figure series in the mid-'90s, they put him in an all-white standard Imperial uniform. And when Dave Filoni put the character in Clone Wars as an Admiral, it was with the intention he later be promoted to Grand Admiral, "like we saw him in A New Hope". Many fans pointed out his error and he had to revise the character's arc such that now he transitions from the military to the ISB (the latter being an invention of the RPG).
I have definitely enjoyed
many of the contributions WEG and Decipher made to the Star Wars universe, but I also feel they created almost as many problems as not.