It has been mentioned that people knew there were ways to fly with the One Power. What good would it do for Rand or Birgitte to say so? Who cares what Lanfear used to be like (and I question your assertion that she was good - that would only be true in the sense of "Not Working for the Dark One" whom no one at the time even knew existed, so it is not like that's a virtue. It's kind of like being an 8-year-old who's never committed rape). What good would it do to tell everyone this stuff? What POSSIBLE use is there in any of this information? It is merely curiosities for ivory tower academics.

As a matter of fact, this was addressed early in tGS - he tried to get the information from LTT what went wrong so he could try to figure out how to get it right, but LTT wasn't playing. How would a non-channeling woman have the slightest clue about the nuts and bolts of a war-winning battle plan? This sort of thing is highly compartmentalized in time of war, and there were US generals & Congressmen and cabinet members whose first knowledge of atomic weapons came when they heard about Hiroshima. Even the Vice-President didn't know what they were doing until he became the President and someone filled him in, and he was the man who eventually ordered the bombing! And we were probably the most open and least censored society of any of the nations that mattered in that war. Now with this in mind, what on earth could an ordinary soldier, an NCO at best, know about LTT's plan to strike directly at the Dark One?

She doesn't, actually. At last count, she had already forgotten stuff POST-Breaking. As far as when she DID have her AoL knowledge, they caught Moghedian shortly after, and that was far more useful data. Why interview a grunt, when you have a general and technical expert?