Living beings and inanimate objects naturally cannot be compared.
During the peak of the Goblin Civilization, magic crystal weapons of Domain Level could be produced in any quantity. Yet even so, they couldn't defeat those clans that possessed Domain-level powerhouses. From this, it can be seen that even magic crystal weapons capable of launching domain attacks are still significantly inferior to true Domain strongholders.
Firstly, the stronger the attack a magic crystal weapon wants to release, the more powerful the energy source it requires. And even if they occupy a continent, it would still be impossible for the NPC side to continuously deploy those magic crystal weapons.