Consider, how easy "rock, paper, scissors" is, yet, there is nothing, per se, physically true about paper beating rock, or scissors losing to rock, or in extreme examples, rock besting paper. These sorts of questions don't come into play during the exposition of the simple "rock, paper, scissors" fiction, except maybe farcically.
The logic just needs to be consistent, not real, in order for the objective, conflict, and resolution to be communicated and understood.
It's okay for it to be grounded in "real". It's also okay for it to be grounded on "unreal". It just needs to be grounded on something.
Where fiction fails, like star wars or star trek, or what have you-- is in deviations from their grounding, not from grounding on the wrong things.