Fantasy and scifi both depend on the happening of impossible things so I think that makes story logic difficult. Then you have to ask the actors to pretend that preposterous things are totally normal. It must be hard for them to keep a straight face.
At the same time, I think that fantasy and scifi are very suited to exploring themes and thinking about what is universal to human nature, precisely because they don't limit themselves to events that could really happen. I remember watching SpiderMan a few years ago and realising that one of the things that is in common with virtually every SpiderMan movie is that once he figures out how to work the webs, he goes for a joyride through the tall buildings of the city. This never made the same impact on me when I was young, but as a middle-aged mom, I was really struck by the realisation that SpiderMan's web-driven ride through the city is essentially an ode to the joy of being young, healthy, and strong.
I think that in terms of writers who write fantasy and scifi, there are basically two ways of doing it. One way is to essentially invent an entire system of magic that is as internally coherent as possible. Patrick Rothfuss and Brandon Sanderson (and probably a lot of other authors I don't know) have written books where a lot of effort is put into the internal coherence of their magical systems. Many fantasy readers really enjoy this kind of thing. Another way is to not really worry much about whether the magic is internally consistent, but to spend more effort on using it as a metaphor for what it tells us about morality or human relationships. To me, GRRMartin and Robert Jordan are more along this axis. This is the approach I prefer, personally, but I think both approaches are equally valid and it's really about what the writer enjoys.
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