It's designed for mid-game use (Fulgora, Gleba, Vulcanus). By the time you get to the cryogenic plant, you're already able to manufacture ice from ammoniacal solution anyway.
The mod the way it is because it matches the melting ratio. That being said, outputting one ice cube at a time should probably be changed, so I'll up the input (it's only water) will be also proportionately doubled or tripled.
