No place like Oz post

what i learned:

• that the monkey talks
• that there is flying baboons 
• also that the china doll is alive (i havn't seen the movie)

opinons:

• i like that they have it where you get to see the landscape of Oz because of the flight of the baboons
• i don't like that he had to really fight for the flying baboon part to stay in

question: why didn't they make a movie revolved around the wizard in the first place?