system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do shows have different directors for each episode? Wouldn’t it have more continuity with hiring just one for the whole series?
gpt
It takes a lot of work to direct filmed entertainment. Even very prolific film directors will make about 1 feature film a year. A series of television is 5-10 times longer but needs to be produced over the same timespan. There are some economies of scale - you don't have to put as much work into assembling the creative team, building sets, etc. as if you were making 5 separate movies, but it would still be an incredible amount of work for a single director. 

Instead, TV shows will often have a "creator" or "showrunner" who meets with the directors to ensure a unified vision. This preserves the "auteur" model where a single person will stand in for a massive creative team in the public consciousness (e.g. Vince Gilligan with Breaking Bad), just now that team also includes episode-to-episode directors.