1. Star Wars is fantasy, not science fiction.
It's actually science fiction fantasy
so it still counts as science fiction. I've heard your statement before and I don't buy it.
2. You ever considered taking another look at Close Encounters? It's not my #2 film of all time for nothing. The plot is very simple, but the arc of the plot is far from simple. It's a complex drama about a man yearning for something more in his life, more even than his beautiful family. His journey to discovering that is fraught with obstacles both external and internal, and along the way he actually hurts his family. Plus, a simple narrative does not have to be a negative. Close Encounters uses the power of visuals, editing, sound and music to create an identifiable reality for its characters and then introduces real awe and wonder within those confines. It's a beautiful film and it's far more complex than mere bright flashing lights and special effects.
For you maybe, but not for me. I don't care for films that are steeped in special effects. I have tried re-watching many times in last 30 years, but every time I do, I feel my intelligence is being insulted. You mention the music, OK I'll bite. If these aliens can traverse through space for light years, don't you think that they would have the ability to monitor our transmissions? Wouldn't they be able to come up with a make shift attempt at one of the more popular spoken languages? No, they use a few musical notes and are so giddy at their success, they decide to have a free form space jam. I was on the floor laughing at that scene.