Every science fiction movie or program requires some degree of suspension of belief/knowledge. Sometimes it's easy to suspend that knowledge; other times we'll spend the movie/program criticizing the nonsense.
Considering the time of release, Star Trek probably did the best job of any show when it came to suspension of disbelief. They did their best to make it *science* fiction. Lasers in the pilot were changed to phasers for the program because they knew that lasers couldn't do much of what was needed. "Phasing" matter into another dimension was more plausible. It seems pretty tame today but remember that it was sixty years ago. One of the comments about the pilot was that it was "too cerebral" and too good for TV.
Fun fact: CBS viewed the pilot but said "we have our own show that we like better." It was "Lost in Space".
Have to agree that the Star Wars series is more fantasy than proper science fiction. Fun, but "it ain't steak no matter how you cook it."
Movies based on books always have to cut so much from the book, or worse, add unbelievable material for audience interest. The Andromeda Strain was a fabulous movie IMO for the early 70s but a fair amount was removed from the book (which I didn't read until later). Watching the movie after reading the book was a bit of a letdown. Likewise Jurassic Park, Timeline, Sphere, and a few other Crichton books.