Good article. Love the comments on the article.
Unfortunately, too many employers think an "outgoing, energetic personality" (very popular in job descriptions) who likes to be known and seen is naturally better "qualified" than those who are more reserved, low-keyed, and don't promote themselves during a job interview. If companies think only specific traits making someone a good worker, then the issue is with the criteria companies are using to decide who is right for the job. Going to a job interview lately is like attending a personality/popularity contest. It becomes about who "excites" them more. This is why it's a problem. Companies need to be held more accountable for their hiring practices. Introverts are just as capable of being effective in customer service, sales, etc. Everyone doesn't need to be an extroverted ball of energy to do their job well.