Please understand that I agree it shows good results, so do lots of other videos & pictures from lots of different suppliers.
But people keep referring to this one.
It must just illustrate the total package for people. It definitely shows what having hair can do to improve someone's appearance.
I have a theory that some heads & faces need hair and for others it doesn't make a scrap of difference to their appearance.
Personally, in this video, I preferred the hair just before the final cut, when it was a bit longer.