Those are all just trappings to tell a story. The science isn't the focus. The story isn't about how they got to that point technologically or how the technology has impacted them. And again, their science had no basis in real current or speculative science, which is the other importsnt definitional aspect of sci-fi. Much of their stuff is powered or made possible by magic crystals (kyber).
Star Trek had a lot of techno babble bullshirt but the space ships behave like space ships and a lot of explanations of things (especially from TNG onward) made an attempt to incorporate real science.
Lucas was inspired by Flash Gordon. He wanted to tell a pulpy adventure story in space, not something that focused on science and its impact.