This is motivated by the fact that in the first epoch there is no in-game reason to decide which player should be given a bad empire. Therefore, only out-of-game considerations apply, and since I consider these to be Bad Things, there's no reason not to make the selection fast and random. If none of the players had ever met then going through the first epoch in the standard way leads to almost the same effect anyway. (The only difference is that some players will know a particular empire is coming.)
The aim of this is to minimise the ``routine'' and therefore boring rolls required by ``I have two you have one'' attacks. The rule has been attacked on the grounds that it will make every empire play the same. An answer to that might be to say the rule only applies from Epoch II onwards. An incidental effect is to make fortifications much more significant. The conditions for routineness are deliberately redundant.