I accept that premise if the goal is opportunity in novel fields. If the goal is simply landing an opportunity I think he introvert’s approach is actually more powerful.

The extrovert has loads of low probability opportunities; they tend to be more varied due to the breadth of their networking.

The introvert is selling to people they know; if they get to the point where they are asking for the opportunity I predict they land a larger percentage than the extrovert. Because they’re drawn from a smaller network, however, they are also likely to be in narrower fields.