Buddy...when the original Star Trek ran, it was a different world, especially in the case of what was allowed on television. The bedrooms of married couples showed twin beds. The first interracial kiss in US television history occurred on Star Trek, and that episode was banned across much of the South. Women were not considered worthy of positions of authority, especially if it included having authority over men. It was literally a different world. Until the advent of Star Trek, "science fiction" on television consisted of simple-minded fantasy series like Lost In Space, Time Tunnel, Land of the Giants, etc. Tropes such as faster-than-light travel and interstellar conflict, which Babylon 5 relied upon, barely existed before Star Trek. Even sub-plots that carried on for whole seasons were rare. Episodes were expected to stand alone.
Let me put it this way: The original Star Trek swam in very different waters than Babylon 5, and it changed the rules in ways that allowed Babylon 5 to be what it was (which was excellent, by the way).