I think the choice of the right de-esser for the particular case is very important on the contrary, as it processes in a very unnatural way the most important instrument of your mix: the vocals. A bad de-esser will make your singer sound like Sylvester the cat (anyone else noticed how this happened a lot in quite a few of the Fredman productions of the 90's?) even if set right. Now I agree, at the end of the day it's just another tool, but... Oh, and not everyone have Pro Tools to use the included plugins (almost all Cubase stock plugins sucked for what I remember) so it's good to know the other alternatives.
I have to agree with what Fab says in the video at some point: it may be a very small difference, or very subtle, but that's what makes the difference between a demo and a record.
They will put up a subscription thing in a couple of months (when more videos will be online), I'm definitely gonna take that then.