i would imagine that technology had been improving the star wars universe just as it does in the real world. its been like 20 years or something so logically there might be some advances in weaponry.
True, but why?
The only lightsaber users post Episode 3 were Vader and Luke (maybe the emperor too, but he was never seen using one in the originals?)
Post Episode 6 the only users were Luke, Kylo Ren, and presumably the knights of Ren. Yet the only known non-First Order saber user was Luke who has been in hiding for sometime.
So why produce anti-lightsaber weapons if you don't anticipate meeting lightsaber users?