Weird. I wonder why they changed it... or at the very least, why they had Qui-Gon go into Tatooine and have Obi-Wan stay on the ship and do nothing the whole time. Wouldn't it have least made more sense if Qui-Gon had been, "Hey, apprentice. I'm gonna stay on the air-conditioned ship and protect the people. You go out into the barren wilderness and try to fix our ship, okay?"