"Always in motion, the future is."
Everything that tries to be futuristic will eventually look dated in time. Even stuff being made today will. But I believe in his pitch of the original Star Trek
series, Roddenberry proposed the idea that the Enterprise
will inevitably encounter worlds that will resemble (if not be identical to) Earth at different periods of history. Sure, you can look at as being more of a budgetary thing to use existing sets and locations around the Paramount lot, but it does bring up the idea that some civilizations may evolve along identical paths and have more similarities than differences.
Another possibility is that one can look at some works as existing in their own universe or continuity, which allows them to have their dated concepts because their history isn't 100% the same as ours.