In the beginning there was One and the One was Stack Overflow. And the one was good. Very good.
Then there came Two - Server Fault - and it, also, was good.
Then there came a Third and the Third was Super User and it, like its brethren, was good.
And the Trilogy was born.
But they used Uservoice, which was only marginally good. And, indeed it was noted as such and thus was born Meta Stack Overflow, and it was good. And it came to pass that all sites in the trilogy were served by Meta Stack Overflow.
And the entities of the Trilogy grew, and grew. And the One grew larger and faster. And questions in Meta Stack Overflow became primarily about the One, with a smattering of the other two.
Then arose from the Creators' minds Area 51, which breathed life into the many sites which collectively became known as The Stack Exchange Network. And it was decreed that each community having its own Meta site would be good.
However, since Meta Stack Overflow was firmly founded and well established and had vast knowledge of the inner workings of the Stack Exchange sites it was maintained as the Oracle of Stack Exchange as a whole, as is maintained to this day.
[or something like that]