Personally I favor the idea of having strategic resources unlock new, more powerful ship components you can use, possibly with their own tech trees to use them. This way you don't lose anything important for not having them, but still gain significant benefits from them with the possibility of being severely crippled by losing access. For example, instead of just giving a flat percentage boost to ship HP, access to Garanthium Ore unlocks the Garanthium Armor tech branch. Garanthium Armor components have more or less the same armor value as equivalent regular armor, but they also give a boost to the ship's HP. So long as you have access to Garanthium Ore you can build ships with this armor no problem. But if you lose access not only will you be unable to build any new ships, existing ships with Garanthium Armor won't be repairable, as you no longer have the critical ore their hulls are made from. Furthermore, since research was focused in the Garanthium tech branch, the empire's knowledge of regular armor would likely be well behind the times, so new ships being built would have significantly weaker armor than before.
All of this means that strategic resources provide powerful, worthwhile benefits, while losing access means significant drawbacks. As they would require investment research-wise to utilize fully, empires would have to balance the risk of losing access and the cost of development with the benefits these components provide. They would have ample incentive to protect access to critical resources while possibly deciding not to utilize some if access isn't secure enough. On the flip side, not having access to a resource in the first place has little effect on an empire. As an added bonus, this system would help differentiate the ship designs of different empires even further.
All of this means that strategic resources provide powerful, worthwhile benefits, while losing access means significant drawbacks. As they would require investment research-wise to utilize fully, empires would have to balance the risk of losing access and the cost of development with the benefits these components provide. They would have ample incentive to protect access to critical resources while possibly deciding not to utilize some if access isn't secure enough. On the flip side, not having access to a resource in the first place has little effect on an empire. As an added bonus, this system would help differentiate the ship designs of different empires even further.
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