I remember Lucas saying many times, that he had to alter the idea of Wookies to Ewoks for ROTJ, because of something to the effect that he had already established Wookies were technologically advanced....yet in ROTS, aside from flying in a dragonfly-like copter they basically exist like Ewoks, living in trees, swinging on vines, shooting a laser rife when they had to.

Budget wise i'm sure it would have cost him more money, but I hardly think that ROTJ would have lost money just by making Wookie suits vs Ewok suits...and is it any cheaper to hire dwarves over tall actors?

Is there something I'm missing from this?