Multiple colony components in one ship

[dogscoff]

Well... it depends. If they wer both the same (i 2x Rock Colony) then yes, that is completely useless. Many modded AIs are guilty of this.

If thy were diferent (ie 1x Rock, 1x Gas) then it just makes the ship a little more flexible, bcause (obviously) it can colonise more than one type of planet - so if it's en-route to a planet which gets colonised by another race, for example, it's easier for the AI to re-assign the ship. A multifunction coloniser reduces the need for planning (something the AI isn't particularly good at)