system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Trek]if the klingons built a ship that could fire whilst cloaked, why not mass produce them?
gpt
What you have to understand is that a 'cloak' is not a binary thing. It is an ever advancing field of stealth technology that obscures a ship against a range of sensors - visual, subs-space etc. As sensors advance, so do cloaks. A cloak from the era of that illustrious captain James T. Kirk, would be completely detectable and hence not a true 'cloak' to the sensors of, say, the Enterprise D under Jean-Luc Picard.

The Klingon ship in question could fire under cloak, but technological advances subsequently rendered its cloak detectable. The Klingon Empire went on to develop better cloaks that could continue to fool sensors, but the special 'fire while cloaked' tech wasn't compatible with those advances and couldn't be modified to work either.