Eddie Fitzgerald has a piece on how the job of director doesn't seem to exist anymore in TV cartoons. I would agree that's the case.
In live action, the director's job is to decide where to put the camera and to work with the actors to shape their performances. In animation, that job would entail doing the board (or at least thumbnailing it) and timing the cartoon. How many directors in animated film or TV actually do that these days?
This ties into my previous post, "Curious." The animation production pipeline that was created in the 1910's through the 1930's was not, I'm now convinced, the best possible pipeline. However, the way it evolved at Disney and spread to studios like Warners, MGM, Lantz, etc. did provide a director with the tools to control cartoons, though at the expense of the artistic freedom of the crew.
What we've got now, between fracturing production among several studios and with directors who don't direct, is the worst of the old system with none of its virtues. The crew is still handcuffed to somebody else's decisions, but those decisions are now made by people who are ignorant of why the tools were created in the first place.