I’ve never really though about this before, as I don’t normally watch much TV, but I’ve noticed it now as I’ve been following Breaking Bad. The show mostly sticks with the same set of writers, the same crew and (obviously) the same main cast throughout the seasons. However, it goes through a bunch of different directors - 24 in total as of now (episode 60), according to the Breaking Bad wiki. That’s just 2.5 episodes per director on average. Lots of them do only one episode or maybe two. Michelle MacLaren has directed the most, with eleven episodes so far. A couple of episodes are directed by Bryan Cranston, and the different writers, as well as Michael Slovis (the DP), have each directed a couple of episodes each, but a lot of the time the director is someone who is not otherwise connected to the show, and comes in just to direct an episode or two.
Apparently, this is also common practice on lots of other shows.
What’s the reason for this? Doesn’t it make it harder to keep the look and feel of the show consistent? Why is this practice different for the directors than it is for, say, the writers, the DP or the editors? Wouldn’t it make more sense to use a smaller group of rotating directors?