It's very interesting to see a demo by a pro, you can understand the options taken for the final design.
But many demos are not done at the right time for the tree, it's the right time for the exhibition, but maybe not for the tree. I did a "contest" once, on young junipers that had to be styled. I didn't win - and I understood why right from the beginning
- but the winner's tree died a few months later, like 9 out of ten that were worked on that day.
Of course, pros don't lose trees like us beginners do, but it can happen : on a French forum where I found the link about Kunio Kobayashi, someone said that when he was younger he made a demo and the tree died. He was so ashamed that he even thought of suicide, which I can believe considering the sense of "honour" in the Japanese culture.
I'm immune to suicide, I've been in touch with the virus too often, so I just don't take part in contests, and only watch demos by super-pros. I don't even participate in workshops with professionals when I have the opportunity : I lost a beautiful Taxus that I worked following the advice of a very good pro in Europe. At least, if I kill a tree, there's no one else to blame than me