2. Technology in the PREQUELS is more advanced than the SEQUELS
Not really, and you're looking at the economy of the Star Wars galaxy the wrong way. The Republic was prosperous for everyone. When the Empire took over, they basically rewrote the history books of the entire galaxy. The Jedi were made outlaws, etc. The "Core" worlds prospered. The tech in 4,5,6 is much more utilitarian than 1,2,3; and that makes sense in an totalitarian economy where all the wealth of the galaxy is funneled into the Core worlds to finance the Empire's rule.
The Empire had an endless supply of clones to fly Tie Fighters, pilot AT/ATs, and be Stormtroopers. Why bother investing money into things like shields and effective armor? Even their capital ships like the Star Destroyers were designed to rule by fear. Giant spaceship shows up at your planet that can rain down death and destruction from orbit if you get out of line. Later, small moon-sized spaceship shows up at your planet and can blow it up. Darth Vader shows up in his Super Star Destroyer. Large scale intimidation.
Meanwhile, the Rebels had neither numbers nor money. Their ships were decidedly more rugged and multipurpose. A lot of Hodgepodge of forces. The Millenium Falcon was just a freighter modified by Han Solo. Even the rebel fleet in Jedi has a pretty varied style of ships. The Rebels would use whatever they can get their hands on or steal.
Barring to many Clerks references, this is one thing I actually think Lucas did right, even if he didn't mean to.
This post was edited on 2/7 at 12:58 pm