I agree about there being too much diversity in the PT, especially since it clashes with the human-centric universe of the original films. I'm sure it wasn't a purposeful choice to have so many humans in the OT, but that's the way it is. That's the universe that existed, and you kind of have to go with that. I mean, George has tried to add creatures into the OT, but it's usually in added scenes that don't connect with the rest of the movie. And you're left wondering why these creatures disappear immediately afterward and go back to human-centric worlds. Oh, wait, that just made me think of something. The extended Mos Eisley sequence is another one that ruins a setup, just like the Jabba scene ruins the reveal of Falcon. The intent of the cantina sequence was to suddenly go from a very human world to a very diverse world. That's why there were so many shots simply of aliens because you'd never seen them before. But then you have the new Mos Eisley entrance with these new creatures added in, and it dilutes the cantina just a bit. You've already seen a buttload of fantasy-based creatures.

But, yeah, the prequels just had to have some alteration on everybody that wasn't a major character. There were so many almost human with a slight difference races.