Not necessarily; the crux of Cosmic Horror isn't about incomprehensible power, but incomprehensible alien intelligence. In a large way it's about knowing that humanity is insignificant but that doesn't really apply to Puella Magi, but the Incubators still seem incredibly distant psychologically, and their technology seems so advanced it's borderline magical, and is probably capable of doing everything except breaking the laws of physics.
Add that the Incubators on Earth are probably artificial creations (they're not REALLY cute little weasels, right?), then what point is there in seeing them? The things on Kyubey's home planet aren't really relevant to the story of Planet Earth, and it'd be just as disappointing as showing the machinators of the game in Bokurano.
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