I know that interfering with a pre-warp culture is a violation of the Prime Directive, nevertheless it would be interesting to visit pre-warp world. For instance, wen you are exploring an unknown system you could encounter a pre-warp civilization and in order to explore it you could beam down to the surface using a disguise and studying that singularities off that culture. Also there could be mission that would require you to stop a faction (Klingons, Romulans and others) of interfering in a pre-warp culture.
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Be real careful though. The native are restless.