The average fan hated Jar Jar so much, he probably thought it would be better to just minimize him as much as possible.
Anyway, these "Darth Binks" theories have me convinced that Jar Jar was actually meant to be not the main Sith Lord, but instead General Grevious. That would totally explain why Grevious came out of nowhere with NO onscreen backstory...because Jar Jar's backstory was probably meant to be Grevious' Backstory.
How much better would it have been if JarJar slices off Anakin's hand in Episode 2, then Yoda destroys him and he comes back in Episode 3 as a Cyborg?
The average fan hated Jar Jar so much that Lucas decided to make him the reason for the creation of the Empire. Thanks George!
And Jar Jar coming back as a cyborg is almost as stupid as a bounty hunter with a jet pack hiring another bounty hunter to kill Padme with a flying drone that releases deadly worms