New writers haven't been learning how to write or showrun because there haven't been the opportunities for them to do so. Companies have been employing mini rooms and not paying for enough writers to do the job, so most of the time, they can't bring in new writers, people that need to learn.
As I've said elsewhere, these are some of the reasons that current shows aren't always great: not enough writers, not enough training, not enough time to do their job.






