Comedy writers rooms staffed for a full broadcast season were large and ran for most of the year. Rooms today are smaller and shorter, and the cause is the episode order itself.
Staffing was always a function of output
A season of twenty-plus episodes needs scripts produced continuously while earlier episodes are being shot. That requires enough writers to keep several drafts moving at once.
An eight or ten episode season needs a fraction of that throughput. Fewer scripts, produced with more time each, can be handled by a handful of people.
The shrinking room is therefore arithmetic before it is anything else. The unit of work changed and staffing followed it down.
Shorter orders also mean shorter employment
A broadcast staff writer could expect close to a year of continuous work, with a rhythm of writing, production and hiatus. A short-order room may run for a few months.
Writers respond by stacking jobs across shows, which fragments availability and makes scheduling harder for everyone. The instability is a direct consequence of the shorter order.
It also raises the number of jobs a writer must find each year to earn the same living. Time spent looking for work is time not spent writing, and nobody pays for it.
Rooms now often close before filming starts
The traditional pattern kept writers employed through production, rewriting as episodes were shot and as performances revealed what worked. Comedy in particular relies on that feedback.
When the room closes at the end of scripting, only the showrunner and perhaps one other writer remain on set. Scripts are then locked before anyone has heard them performed.
The lost step matters most for comedy, where a line is funny or it is not, and the discovery usually happens in a rehearsal rather than on a page.
The training ladder lost its middle rungs
Junior writers learned by sitting in a long room and then watching their pages produced. That progression is how a staff writer becomes someone who can run a show.
Short rooms without production attachment remove both halves of the apprenticeship. The industry keeps hiring showrunners while shrinking the structure that produced them.
What the shows sound like now
Small rooms produce a more consistent voice, because fewer people are writing. That can be an advantage for a single-perspective show and a limitation for an ensemble.
Large rooms generated volume and internal competition, which is how joke density was achieved. Ten people pitching alternatives for one line produce a better line than one person writing it alone.
The trade is coherence gained against alternatives lost. Neither arrangement is better in the abstract, but the choice between them is now made by the episode order rather than by the show.