Those things are built that way so that they are easily understood by the player. like it or not the fiction is just trappings ontop of the game design in most cases. Levels and systems are designed with usability first and then fiction is added on top. Usability and convenience come first, that is also why aliens in most movies speak English or we and or they can easily learn each other's languages. And it's also why aliens are predominantly bipedal humanoids as it's more Search Results relatable .
Having said that I would be super interested in a sci-fi game where the aliens speak a language that humans can't understand, where their tech is unusable to us and we got to visit truly alien worlds that completely buck tho conventions of our own. But I'm a bit of a sci-fi nerd so I also understand why a game designed like that will only ever be a very niche product. Because a game designed to be entirely alien to the player by very definition will alienate the majority of the audience.
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