Woohoo! Loving the peek at the latest graphics. Also enjoying the lore drops, though I do have an issue with what I heard this round. For a space faring civilization, planets are a horrible way to gather resources. Mining at the bottom of a gravity well is energy intensive compared to mining asteroids and other small bodies in space that have almost no gravity and no teraforming requirements. This is going to be true for pretty much any level of tech.
Just a thought, but what if rather than being miners who teraform a planet to get at its resources, it should be the other way around. the Gatestriders should be planet teraformers first and foremost, only mining resources needed to complete the job locally. When you consider how few planets there would be close to earth that would themselves be earth like (read none). It would make a lot of sense for a group of people to become teraformers to open up new worlds for colonization. A group of Lewis and Clark's rather than a mining corporation.
Maybe that's what you already intended, but from this video it sounded like the Gatestriders were nothing more than futuristic strip miners with fancy tools to do the job. (Perhaps some stripper miners in assless chaps though...)