Rogue one actually explained that 38 year old plot-hole with some ret-conning
But yeah, it's a silly space opera really.
Exactly, the cheesy and hamfisted good vs evil 'plot' in these films has never been more than a vehicle to string together sequences of spaceships shooting at each other, and people waving silly laser swords around.
If you apply any kind of critical analysis (or artistic analysis for that matter) to any of the films, you're going to be disappointed. Just sit back and enjoy the pew pew...