They don't really innovate in the Star Wars universe do they?

I mean...a ship owned by an outlaw and his walking teddy bear is the fastest ship in the galaxy.

The ship is part of a discontinued line of ships for god sake...why hasn't The New Republic or ANYONE in the Rebel Alliance for that manner even come close to replicating it? xD

Furthermore...there aren't really that many scientific advancements in the universe, it's like they're in a state of technological stagnation, as in Knights of The Old Republic they have similar tech with pretty much the same potential.