Technological stagnation
Technological stagnation is a feature of both the Star Wars and Star Trek universes; technological progress in both settings is negligible over time.
Stagnation in Star Wars
Technology in the Star Wars galaxy seems to have progressed little over the course of millenia. Technology see in the early days of the Galactic Republic[1] differs little, if any, from technology available during the time of the Galactic Empire and later. Given the scope of the Star Wars society and the number of corporations competing in various fields, it is likely that there are few additional scientific discoveries and technological breakthroughs for them to make. Even innovations like the Death Star are actually just unprecedented up-scalings of established technologies.
Stagnation in Star Trek
While the changes in the technology used by the Federation over the course of a few centuries suggest relatively rapid technological progress in the Star Trek universe, Star Trek: Enterprise reveals that all of the advanced technologies used by the Federation in the 24th century were actually well-established technologies for other civilizations by the 22nd century. For the Federation, developing new technology is largely a matter of acquiring it from neighbors who already have it.