By that I mean that the basic premise being: that the means of (re)creating new technology is lost, the current technology around is treated as sacred and the function marred in elaborate rituals or prayers because they don’t know how to otherwise operate it, and to a lesser extent that new ideas or (often xenophillic) research is met with suspicion or outright rejected because it doesn’t fit with the religious dogma.
I keep feeling that a similar group is somewhere in Star Trek, right on the cusp of my memory, but I can’t seem to recall any specific examples.
I think that Trek plays with ideas like this by creating throw away alien races. By that I mean they’re not foundational, but rather are used as a cardboard cutout to illustrate a point for the plot of an episode.
For the tech angle, I think there’s a couple of candidates. The Bynars, for instance, had an intimate coupling of technology and society - and here I’m mostly thinking about the way they were floated in TNG.
At the other end of the spectrum you have the Pakleds. Although they have a high tech space faring society, their grasp of the science and engineering that the tech requires is… rudimentary and primitive. They’re not creating new technologies.
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They don’t need to if they can just scavenge other people’s tech/trash.