I think this conversation is confusing two things. There are two kinds of exploits that would be possible via the landing pad if certain restrictions didn't exist: * If the landing pad allowed insertion as well as withdrawal, an arbitrarily large landing pad could allow item teleportation by inserting at one point and withdrawing at another * If multiple landing pads were permitted on the same surface, items could be teleported (in O(1) time, not 0-time) by launching a rocket from one side of the factory to an intermediate surface (planet), then launching from there to a landing pad on the other side of factory on the first surface (this exploit is explicitly _allowed_ in Space Exploration, the mod which inspired Space Age)