The reality is that lots of your favorite franchises had to suffer through ill-conceived false starts before rounding into shape, at which point their creators hoped you would forget all about the early efforts.
While it's easy to imagine watching the hopeful utopia of Star Trek and saying, 'Let's make that real!' it's a little stranger to think the same after watching Blade Runner or Gattaca. Yet here we are.
Writing a movie is hard work, and when all is said and done, there are always going to be a few small subplots that get ignored in the third act. But sometimes a filmmaker forgets an important plot thread. And by that, we mean something way more important than the main plot.