Re: In the alt timeline in Yesterday's Enterprise, I'd like to believe
Given they weren't used during the Dominion War, despite how bad it got, it's likely Carol destroyed the knowledge of it after it didn't work and her son died over it. Heck, I wouldn't be surprised if it was a treaty requirement in the Khitomer Accords given how antsy the Klingons were over it.
"I was never a Star Trek fan." J.J. Abrams