I don't think anyone is talking about pre-generated fractal world... more that... there *is* no world yet. Everyone has to agree on the world (or at least a majority.) It's not gotten to that stage yet, so no one knows what *kind* of civilizations the world can support.

So maybe none of these races will fit once the world is decided.

It's not a matter of picking too few or too many jurors yet... You don't pick a jury *pool* at all until you at least have a case