Well hey, since we seem to think a lot alike have another one of my unsolicited ideas.
All the advanced tech you see around Remnant is either bought from Atlas or made from a company that bought a temporary licence to use the blueprints fro Atlas. Everyone else's native tech levels are at late-industrial levels (1900-1940s)
Airships, however, are still a thing for everyone because airships work by simply applying anti-gravity dust to fly. As a result, airships are more common than traditional planes that use lift and thrust to fly. If you make Whitley a villain Weiss has to defeat to gain control of the SDC I'll find you. None of the sisters deserve it after running off to play Huntress, let the boy have the company at least...