Those are awesome videos.
There is a lot of overlap in purpose between knives and scissors. And there are a few tasks where one is better suited over the other. If someone is more comfortable using one over the other, It's not usually a big deal.
One way scissors shine is the ability to cut sufficiently even after suffering all kinds of dulling and abuse for years without any sharpening. Even the cheapest stamped steel scissors from the .99 Store will likely last the average user many years of duty. In contrast, a knife that is not maintained at least somewhat becomes a spatula before long.
I do think there is a whole 'nother world for knife nuts to explore in the realm of scissors. Despite sharing a good deal of technology, (and much technology that's completely unique to scissors) as far as I know, there aren't any real "scissor nuts" the way there are knife nuts. Even though the level of sophistication is just as limitless, and specialized.
ETA: It'd be nice to be able to buy a pair of Chinese forged scissors by that guy. Anyone got any leads?