Sitting around and talking about an idea is useless?
The entire point of the article is not to discount these things because they are useless, but to discount them because a small percentage of the population find them uncomfortable.
Funny, that's not what it said when I read it.
Those things can be useful but, since other (opposite) things can be useful and even necessary as well, practicing them to the exclusion of all else like you're suggesting is stupid and counter-productive.
Introversion is a personality trait, with advantages and disadvantages. To say that introverts "should think about getting some kind of therapy" simply for being introverts is simply irrational prejudice.
(1) http://www.capt.org/mbti-assessment/estimated-frequencies.ht...