For me time might be even more important than cost of tech. Spending gathered resources in (semi)peace time doesn’t require skill.
Holding out (while enemy have managed to penetrate your base and destroy such a vital building) arguably requires skill, self-control and tactical sense and should be rewarded with restoring important part of a late-game eco.
For majority of cases sieged player wouldn’t be even able to rebuild it. But hey if you can manage that - that’s cool.
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