Phasal transporter. Am I the only one that loves those things? Especially as supremacy with coverage over Firaxite.
All you need to do is take one city with your ships/hover tanks, or extend your orbital coverage out far enough (now possible with that new satellite in the other thread) and you can insta-tele 7 units right next to an enemy city. you don't need to bother if they've settled near firaxite and you have a few points in supremacy.
I know, like most of the unused things, it's on an out-of-the-way tech that's probably not worth the cost, but if late game became a thing like you said then it might arguably see more use.
Also, having 2 attacks and half strength is better against units. Because, the first attack does damage, and then the next attack does more damage because the enemy's strength scales down when they're damaged. Plus, you might be able to get an optional which is bonus against damaged units.