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Here's an obvious sci-fi one: there's FTL that doesn't involve making space somehow smaller, but the most effective weapon isn't just a rock with an FTL drive behind it.

I'm asking mostly in terms of worldbuilding: author or screenwriter includes element x in the setting and doesn't notice what this entails for the rest of the world, or perhaps something is done for the plot that leads to you asking, "Why doesn't everyone do this," or "Why has this never been done?"