A lot of this has to do with Bioware's general Star Wars lore fail and lack of research before making their Star Wars titles.
Before Bioware mucked about in the Old Republic era things were different.
Inter-stellar travel existed but was incredibly slow. Lots of people still used swords, bows, and similar primitive technology despite having space travel. The Republic was not massive, corrupt, and left its own systems to govern themselves. The Jedi had families, marriages, the great Jedi teachers had many students.
Though energy weapons did exist they were somewhat more primitive and functioned much differently then blasters.
But all was abandoned so that everything could be 'iconic.'
Yet ironically we can't even play an unarmored Jedi, with a single lightsaber, who is primarily a melee combatant. Bounty Hunters can't use carbines. And the stormtroopers are good guys.