system
Given the following post, respond as if you're commenting on Reddit:
human
[DOOM] Why is destroying the argent energy filters such a huge setback to the UAC?

If they built them once, they should be able to do so again. It's not like they destroyed the blueprints after finishing them, and even if they did get lost, they should be able to figure it out again. Plus, there's still the wreckage that should be salvageable to some degree.
gpt
The Filters were designed to channel and then purify Hell-Energy, an energy-form that is exceptionally dangerous to handle in it's raw state. In fact, given how Hell-Energy tends to react to things, it's probable that the Argent Filters actually contained some fragmentary material from Hell it's self. Be it organic components from some sort of Demon, or some Demon-made construction, it wouldn't really matter, because replacement of something like that would be extremely difficult.