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.
The Aldeans, from TNG’s first season “When The Bough Breaks” are close, though they don’t necessarily treat their advanced technology as “sacred”, though they certainly see it as infallible. The whole setup of the episode is that they would hide the planet away from the universe at large and have only appeared before the Enterprise to steal their children as the now-deteriorating technology is causing the Aldeans to become sterile.
Try that on a small planet, I guess.