I like that there was no way even to guess that this coincidence occurred until we became able to scan Venus with radar. Visually, all faces of Venus are indistinguishable.

I wonder whether we have the moon to thank for Earth having retained a short day, and the short day for our magnetic field. Big moons of inner terrestrial planets must be vanishingly rare in the galaxy. If terrestrial planets with magnetic fields are uniquely suited to breed up complex life, that might by itself account for the Fermi paradox.

But I don't know how to evaluate the notion that our gross moon has protected Earth from the near tidal locking Mercury and Venus suffer.