Lucas invented the star wars universe you all like, and some other doops wanted to make use of that and write something about it rather than finding something new on their own. They take a planet, describe it, and when Lucas describes the planet in his true sw universe its "screw you lucas" ?
Remember it's an entire planet. On Earth we got all kinds of climates and in sw only one. Still it's a damn planet, room enough for trees
Lucas might leave a continent or two full with trees for the EU..