In Star Trek 6: The Undiscovered Country, we learn that General Chang has a unique Bird of Prey with the ability to fire while cloaked, something that up to that point was considered impossible. But after that point, I don't think I've seen another ship with that ability again, even through the TNG timeline (I'll admit I'm not as familiar with DS9). Did the Klingons (or anyone) ever come up with another ship that could fire while cloaked?
I understand that Chang's ship was a one-of-a-kind prototype and was destroyed. I also understand from this source that Chang's house built the ship in secret, so the technology was never shared with the rest of Empire.
But it seems to me that having the ability to fire while cloaked would be important enough to have Klingon scientists all over the Empire working on it. Surely, Chang's ship builders weren't so far ahead of the rest of the Empire that no one else ever figured it out, especially over the 77-year span between TUC (2293) and the end of the TNG series (2370). And wouldn't Chang's house still have the knowledge to build another one?
Why don't we ever see another ship with the ability to fire while cloaked?