@NiceGerbil
I don't think the star Trek films count, to the pp
Especially the one with Spock's rocket boots!
I say that as a hardcore star Trek fan.
The original series was groundbreaking in terms of nichele nicholls, Russian on the bridge etc and of course Kirk's monologues etc essentially criticising USA society and politics at the time it was made
Agreed the original series was groundbreaking - the first interracial kiss on American TV and all that but there is no reason to watch the movies for any other reason than their historical interest.
One thing that has to be remembered is that no matter when a film (or any work of fiction) is made it's not, ultimately, about when the film is set - whether past or future but the time it it was made. Especially true of Science Fiction films but also historical films.
The book Invasion of the Body Snatchers by Jack Finney has been filmed four times. Invasion of the Body Snatchers (1956) Invasion of the Body Snatchers (1978), Body Snatchers (1993), and The Invasion (2007).
For those who don't know the story it's about an invasion from an alien source which transforms your friends, neighbours, and all those around you into soulless automatons serving some greater group intelligence. While the films follow the same basic storyline they are vastly different in the way they treat it. The first film (1956) is clearly a metaphor for the Communist Paranoia that was gripping America at the time. The 1978 remake is about the soul destroying conformity of modern urban life. The third about the mistrust of the Industrial military combine, and I'm not sure what the fourth one was about it was so shit I've tried not to think about it. (There is apparently a fourth remake in development.)
Films set in the far future are not about the far future but about how we want the future to be, or fear it could turn out from our point of view now. (Or at least best guesses of film makers who need to get bums on seats about what we want or fear.)
Same with historical films. Professor Marsden and the Wonder Women (a biopic of the creators of the comic book character Wonder Woman and the last historically set movie I watched) wasn't about the theory behind the creation of the character, or the character's strange bondage/empowerment issues that got him into trouble in the 1940s but about our modern day attitudes to polyamory and sexual freedom. (And a damn fine but historically inaccurate film it is too.)
No western is about the real 'Wild West' but what we want the wild west to be. There is no way that the west could have been as depressingly depraved and relentlessly brutal as the 1970s spaghetti westerns or as cheerfully bland as a Gene Autry serial.