I think you made the right call. I DID use the Anomaly expedition feature and loaded up with elements and tech I thought might be useful, but none of that was available when the expedition started; even when I got off planet, calling the Anomaly wasn't immediately an option. I'm only a few milestones in, I'm sure I'll see it any minute now, but if I'd thought it through I might have stored more mid-game materials! I'll update when I get there; very curious about what else I can bring over from my main save.