There are times when making some decision is more important than what the decision is. If it turns out to be a bad decision, you can always fix that later on.
If something like the I Ching helps you get to the point of deciding on some course of action, then it is useful.
A nice example was one of my friends at university, who couldn't decide between three girlfriends. One night in the bar he decided to toss a coin, with the three possible outcomes of heads, tails, and standing on its edge. The coin rolled across the floor and stopped almost vertical against the edge of the bar. Last time I heard from him, his wife's nickname was still "edges", and he had been happily married for more than 30 years.
The video's comment about these decisions defining "what sort of person you want to be" doesn't seem helpful at all. After all, if high school kids already knew whether they really really wanted to be professional sportsmen/women or astronauts, they wouldn't be agonizing over an impossibly hard choice!