I love worldbuilding. It's as much fun for me as writing itself. It's like a hobby of mine.
Patrick RothfussUnfortunately, a lot of fantasy is chock full of sexism and racism. A lot of authors don't even realize they're doing it, and a lot of readers don't know they're reading it. That's what makes it so scary in some cases.
Patrick RothfussAlso, worldbuilding touches all aspects of your story. It touches plot and character as well. If you don't know the culture your character comes from, how can you know what he's really like? You must know your characters on a much deeper level than you would if you just shrugged your way into a cookie cutter fantasy world.
Patrick Rothfuss