Why do we have solar eclipses? Because the Moon happens to be 1/400th the diameter of the Sun, while also at 1/400th the distance from us. But how come such a coincidence?
If the Moon was much larger or closer, the tides would be quite disruptive. If it was much smaller or distant, it wouldn't be a good asteroid shield. Either might have prevented our emergence.
It's a coincidence Earth has such a Moon, but it may not be such a coincidence we're here to see it.