I could see this for things like the shards, but not every other resource. It is unlike civ in that you don't JUST have one supply of metal which is merely a prereq for units, but you are actually stockpiling that resource too. Units in civ do not cost in units of iron, or oil, unlike Elemental where you need 5 metal or so. But the shards i could see needing to be connected to the capital, being the home of your sovereign n all.
