Slice Backhand Tutorial Uncovered 2017

This is for all of those self confessed 'Guru' Tennis Coaches out there.
Take a listen to the opening spiel and the word that is used when speaking about the slice backhand.
I believe the word is 'ESSENTIAL', however it is interesting to note just how many baseline robots at a young age do not in fact hit this shot due to lack of knowledge on it.
So is it being taught ?
I believe this short video is one of the most educational ones you will ever see due to the fact that it actually explains that the slice backhand can be used in more ways than one......