Ithirahad keeping entire planets loded constantly through a Starmade equivalent of a world anchor, would create more problems than it'd solve: namely, keeping those huge things loaded means server load, even if there are no block updates happening since the core miner only deletes blocks until it reaches the core. From that moment, no block updates happen, and if it's a docked or high orbital (outside gravity) mining rig, no collision detection checks are made either. Which was the whole purpose of the idea: gaining resources without excessive planetary destruction and the ton of block updates created during it.