There’s a lot more to creating a TV series than just the filming part. There’s writing, preproduction, locations, casting, filming, post production, editing, scoring etc. So shows tend to have several episodes in production at any one given time so each will have a director in charge of overall keeping that episode together.
And it also depends on the show and the people involved. A lot of UK series for example tend to lean towards fewer episodes and fewer directors and writers. Derry Girls has a single writer and director for the whole 3 seasons. Fleabag likewise (though I think they had a different director for the initial pilot).
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