fantasy and sci-fy really aren't that dissimilar under the hood, like, starwars is the classic example with luke being the young 'Knight' aided by obi wan the 'Wizard' going on a quest to rescue leia the 'Princess'
Sure, Star Wars and Flash Gordon are fantasy with some sci-fi tropes laid over the top.
But something like 2001 or even Arrival is going for a different sort of aesthetic.
the species they encounter in space or classic fantasy should bring different perspectives influenced by what they are, because encountering these wildly different creatures who ALL somehow manage to have the exact same perspectives as humans is rediculously far fetched and the least interesting choice possible to me.
I don't think Star Wars really shows us any interestingly different aliens.
And I don't look to different fantasy races to provide me with an imaginary study in non-human ways of being. I look to them to either provide colour (this is what, say, lizard-folk or frog-folk/bullywugs are for) or to provide ways of thinking about human capacities and foibles (this is, at least traditionally, how I see Elves and Dwarves and Orcs).
But those affinities and perspectives must be somehow different than those of humans for that difference to be more than cosmetic compared to them.
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Elves also have immortality, superior senses and health, powerful fëa etc, and the affinities and perspectives of the elves are shaped by these.
But JRRT doesn't try to show us how immortal, super-healthy beings would act.
Rather, the immortality and health of Elves creates a fictional, almost metaphorical, context, for thinking about how higher ideals might be dealt with, if those mundane and worldly concerns could be set aside. When joined with other beliefs JRRT has about humans and
their fate vis-a-vis mortality, it also provides a way for thinking about those matters.
I don't agree with this at all, nor I think there even is such a stark difference between scifi and fantasy. Granted, for gaming deep xenofiction might be hard to do, but more moderate take on the level of, say, better Star Trek species is pretty feasible. And there still could be some options for more alien perspectives for those who find exploring such appealing.
My Star Trek-fu is not that strong, but Vulcans and Klingons (the Star Trek aliens I have some familiarity with) don't seem all that non-human to me.