I agree completely. In general, the story of an episode should be completely independent of anything else in whatever universe you're writing for. From our Series Bible
Avoid excessive references to Star Trek (The Original Series). Please don’t have our characters "name drop" the characters and incidents from the original series unless it is absolutely vital to your story. If your script concerns the tribbles, you may certainly invoke Sherman’s Planet for flavor, but please don’t have one person encapsulate the entire plot of "The Trouble With Tribbles" to another.