There is a huge difference between one point of similarity, and say, three points of similarity. Using the Borg as an example, if you have one point of similarity, your work contains a cyborg race. This is "Scènes à faire, the scenes that a specific genre usually have".
But if your work contains a:
Cyborg race
That assimilates all other races
And flies around in powerful cube ships
Then you have "created" the Borg. With every point of similarity added, it becomes an order of magnitude less likely that the similarity is coincidental.
You can look to what the current owners of the Star Trek IP does to people who produce fan works for the only appropriate response.