[dryarzeg]

I guess it's because being extroverted is more positive for society as a whole than being introverted. And so society is trying to -- even if it's not always a conscious efforts made -- kind of encourage and reward this type of behaviour.

EDIT: of course it's not all that simple. IMHO a society of pure extroverts would be an unstable network of salespeople with nothing to sell and no one to engineer and manufacture the things needed. I'm joking here, but... :)

[NeutralCrane]

I’m not sure the statement “being extroverted is more positive for society as a whole than being introverted” is true.

[dryarzeg]

I'm not a psychologist, neither I'm a sociologist, so I may be wrong. It's just my guess, don't take it too seriously.

[grugagag]

Society does need quiet thoughtful people even though they’re usually outside the spotlight and harder to get their recognition.

[dryarzeg]

No one says they are not needed. It's just that extroverted individuals typically create more relationships within society, and those relationships are usually stronger. However, it's not always the case -- for example, introverted individuals may have a smaller number of relationships, but those relationships may be much stronger.

Society exists because of those relationships, and so it is good for its survival and success if the number of relationships or connections within society is growing and they are becoming stronger. It is basically the existential need for any society.

(I'm sorry if I'm wrong, I'm not a specialist in this field, it's just a bunch of guesses based on my observations)