:D I think the guy on the 1st vid is actually doing it for real. That's OK to a point. I think if you admit that your just showing off to show the extreme edge of guitar playing BUT make the point that it starts to get unmusical then people will accept it as a pointer to whats possible.
I think this is why certain shred players are successful & others are not. Vai, Satch being the 2 obvious choices. Vai push`s musical barriers [ not always successfully ] to try & express himself, Satch prefers the heads down rock song with some great guitar bits so we can all play "air guitar" along with it. I think this is why Ynwie Malmsteen has been very hit & miss. Obviously a great player just not particularly musical with it. Hence the fact we all now the guy but very few of us actually have any of his music.
You have to try to strike a balance at least imho........
:D 8)