The question is raised after this revelation of what is it that they leaked? And if they leaked info to the media then did they leak anything else to someone else? Say foreign entities? The FBI has lost all credibility at this point in time, following disaster after disaster how can the American people be expected to trust them? These questions are being raised because the public doesn’t trust the FBI, they are all fair game.
It is entirely possible that more than just leaks on the investigation was put into the public sphere, there could have been anything from the names of advisors or administration secrets. The possibility of them leaking to a foreign entity is also possible, especially considering the fact that the leaks were meant to hurt Trump.