Galactricraft should be added simply because it adds new worlds, goals, and content. Creating new environments for player who have mastered the overworld. https://www.google.com/amp/www.mc-mod.net/galacticraft-mod/amp/
Idk I feel like adding Galactic craft would take away from the idea of Gigabyte. Gigabyte's meant to be a really techy pack and even though Galactic craft is very tech like its kinda its own whole adventure deserving of a mod pack built around it. I feel like it would make Gigabyte just a Space X MK II, which isn't the goal of Gigabyte. At least from what I'm aware of. Also I know from experience dimensions can add lag to any modpack and I think avoiding dimensions would be best for a pack about machinery and tech based mods which are notorious for lagging if not done cautiously. I hope I haven't discouraged you though. ;-; We appreciate all and any suggestions and would be happy to hear any more ideas in the future!