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?
Regards,
Silver
"Discovery consists of seeing what everybody has seen and thinking what nobody has thought"..........Szent-Gyorgy