Yes. Star Wars needs its expanded universe to flesh out the details, because actually not a lot is given, in the movies. The films are a tiny snapshot in time in the SW universe. ST canon policy dictates that only on screen materials are canon. Which is fair enough, as Trek has over 700 episodes spread over six television series (counting TAS) and 11, soon to be 12, movies. SW has six movies, two spin off Ewok movies, an Ewoks cartoon, a holiday special, a droids cartoon, a Clone Wars miniseries, a CGI Clone Wars series, a CGI Clone Wars movie, an animated spoof series (Detours), and a possible live action series in the making. And that's before we even get to the countless books, video games, comics, etc in both franchises. I haven't read a lot of the SW books. Or the ST ones, for that matter. More into visual materials based on these franchises. Personal opinion doesn't make something non canon. if it was produced, filmed and aired, it's canon. Even Caravan of Courage.