Because it is absolutely critical that we get this right…
http://starwars.wikia.com/wiki/Star_Wars_Legends
Star Wars Legends, formerly known as the Expanded Universe (abbreviated EU), encompasses every one of the officially licensed, fictional background stories of the Star Wars universe, outside of the original six Star Wars films produced by George Lucas and certain other material such as Star Wars: The Clone Wars, created before April 25, 2014.
(obviously if the PT movies are not EU, ST movies are not either)
https://en.wikipedia.org/wiki/Star_Wars_expanded_universe
The Star Wars expanded universe (SWEU) encompasses all authorized media and officially licensed Star Wars fictional material. The expanded universe includes books, comic books, video games, toys, television films and other assorted media. Any media directly produced by Lucasfilm is considered official Star Wars canon: the Star Wars films, the Clone Wars TV series and the Rebels series.
If you want to call the PT and ST something silly like myEU, go ahead, but they aren’t EU.