Someone, who will not be named, recently posted on an open web forum about how she though fantasy writing was simple and then went on to state she had never read any.
Sighs. For the record, my upcoming publication, Shadow Over Avalon has eight major threads aside from the primary one. It also has many peripheral threads. World building is crucial in fantasy. Also, what many people do not appreciate is that fantasy and sci fi must be compatable to literary fiction. Aside from extensive world building,, extensive research went into this project. Is it simple? Just try manipulating multiple threads and tell me if it is simple or not. As it happens, I went back to the tenth century for data on this project.
Walk a mile in my shoes before you slam fantasy as simple.