Here's the problem. That's fine in theory, but in practice it only works in books. It only works in a medium where you can actually get into the Aliens head and see the thought process. At least it only works long term. The problem is the ability to emote is tied into human visual storytelling. It's the only way the viewer has of getting into the characters head and establishing empathy with them. In the cases where they do not do this they are either portraying monsters for which deep empathy is not required, or they typically flop horribly as the audience is at best disinterested. Scientific concepts are interesting in the abstract. But at the end of the day they must still be told in a common and all too human visual language. This is why Yoda has Einsteins eyes. Why even Jabba the Hutt has such expressive eyes. It's also why some Alien interpretations fail to click with audiences. The classic example is the Alien hybrid from Alien Ressurection (or the similar bland beasts in Prometheus. About the only recent SF movie to work around these limitations well was Arrival. Which essentially was amovie about those limitations.
Yes SciFi demands more Alien aliens. Unfortunately drama and storytelling demands emotive and empathetic aliens. So not very Alien aliens. In a visual medium drama and storytelling wins.
Yes. The point is, you must actually try, and try hard, to take risks in this area, even if the audience will not let you go as far as you'd like. It's the "settling" that gets me. Makers of SF shows must make compromises, but they should not be okay with the compromises, and they should be trying to get the audience out of its comfort zone, judging of course how often and how much it's safe to do so.
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What I don't like is when the makers of new stuff labeled "Star Trek" in a sense conspire with the non-SF-minded (but more sci-fi minded, in other words, SF Lite) majority of the audience, so that the compromises become what "Star Trek" is thought to be all about, and we're in Funny Forehead Land forever.