It is NOT something that needs to be produced every episode if you have a competent team. It IS extra work, and it IS indicative of what's been falling onto storyboard artists since boarding went digital. You're now sometimes expected to time things out to audio, when that is the work of an EDITOR

You are expected to draw every little pose, which is the job of a posing director, character designer, and animator. Animation is SUCH a huge team sport. By putting board artists on this pedestal, companies have made MASSIVE pressure on a stage that used to be done competently on sticky notes.