My opinion is that a teaching video that demonstrates a fly that is tied without using the rotary function is universally applicable to every fly tier. If the tier uses the rotary function, only tiers that have a rotary vise can duplicate the instructions.

One must ask what the purpose of the video is. Is it to demonstrate how to use a rotary vice to tie the fly, or is it to show how the fly can be tied on all types of vises?