1) Those in the media who are exonerating the FBI by claiming it had no duty to warn Flynn about lying are (deliberately?) missing the point. Legal scholars note that the real question was whether Flynn understood the interview was taking place in an investigatory context.

2) Why does this matter? Because government officials talk to each other all the time, not as part of investigations. As the McCabe memo from that day itself makes clear, the initial part of his conversation with Flynn was about a training exercise.