10 Crazy In-Universe Rules MCU Characters Must Follow

10. Celestials Don't Interfere In Human Affairs

Let's kick things off with one of the most common complaints in the MCU, that as the franchise has expanded its roster of ultra-powerful superheroes, it's become tougher to explain why these beings haven't helped out the frontline Avengers in major Earth conflicts.

In the case of the Celestials, however, an attempt has been made to hand-wave this "plot hole" by affirming that the Celestials and their adjacent creations are bound by an oath not to interfere in human affairs.

In Marvel's What If? animated series, The Watcher (Jeffrey Wright) reiterates that he cannot and will not interfere in the events he observes, while in Eternals the Celestial Arishem will only allow the Eternals to involve themselves in earthly affairs if the Deviants are part of a conflict.

This flimsy rationale becomes even more twisted when it's later revealed that Arishem actually posted the Eternals on Earth to kill the Deviants and ensure the planet became populated enough for the Emergence to happen, which would in turn birth the new Celestial Tiamut.

Granted, Celestials are so far beyond the realm of a typical living thing's experience that we can't imagine this oath bothers them all that much, what with the universe being as endlessly vast as it is and humanity a mere speck on it.