system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Why does the galaxy’s level of technology never seem to advance?

In the three trilogies and associated other media, I never get the impression that technology is ever moving forward. Sure, people will build new planet killing super weapons, but the rest seems to stay exactly the same. 

They’re using the same starfighters for decades. Which I know is relevant to real life, but never do we get the impression that older ships might be technically outclassed by newer and more advanced variants. 

Blaster weapons seem virtually unchanged in 60+ years. I would even say that some of the Clone Wars era weapons seem more advanced than later iterations. 

They don’t have electronic banking. 

Furthermore, stuff from the Old Republic (which may or may not be canon, I know) seemed to be no less advanced, despite a thousand year gap. 

What’s the reason for this technological dark age?
gpt
Rapid technological growth can only last for so long. You can't have each generation have clearly better tech than the previous generation for 25,000 years. At some point you'd achieve technological godhood, and there's nowhere to go from there.

Technology peaked, or at least the growth has slowed to something more logarithmic.