Well, this is a big community, where one of the common goals is to preserve the Original Trilogy. Everyone whose contributed to this cause, have used many sources. These sources all lead up to the Original movies, which were created by George Lucas & the entire team involved. Without them, we’d have nothing to talk about.
However, if George Lucas never made any changes, then we’d have nothing to do, except discuss our love for the Original Trilogy, and, to a lesser extent, the Prequel Trilogy.