How precise are you defining these to be? The Moon's distance from earth increases yearly for example. The magnetic field fluctuates over time, possibly causing havoc to migrating animals. This argument seems like a confusion of cause and effect.
My circular bowl was designed perfectly for my circular water to sit within...
The moon's placement is also such that it's the same size as the sun when viewed from the earth, making total solar eclipses more stunning, and intelligent life viewing them may become a more inquisitive species, and maybe more likely to innovate Agriculture, and so sit around in cities considering philosophical questions. But is this the only Destined Entity?
Just as today's humans consider cats and apes to be not self-aware enough to be Destined Entities, maybe some future specimens of humans will consider today's humans in the same way. Or maybe humans today will create some future planet-wide automated intelligence that becomes self-aware, and be the Destined Entity, and the Anthropic Principle will really be the Robotic Principle.
But just as today's humans are the result of thousands of trial-and-error experiments of evolution, an automated intelligence has more likelihood of becoming self-aware if there are many separate instances of it. If it's planet-wide, then different vastly separated planets are needed. So perhaps a moon for the earth increases the ease with which humans can adapt to space colonization, then Mars providing the next challenge, then terraforming Venus, more difficult, until humans blast off into other solar systems, eventually colonizing the galaxy. And one day, one of those planet-wide automated networks on one of the colonized planets will become self-aware enough to be considered the Destined Entity the Universe came into existence for.
Such a self-aware automated intelligence will reminisce with itself that the moon "Luna" of old "Earth" had the correct placement not only to deflect asteroids, but also to display solar eclipses with a spectacular corona, and provide a baby step for space colonization by humans.
The moon has not always been at the distance away from earth that it is now. The moon is moving away from earth at about 1.5 inches per year. Thus, one cannot argue about its placement because it has not always been at the distance it is now. What people knew about the moon before the 20th century is merely an artifact of when literate man appeared on earth.