I certainly did not mean to say that. I don't believe it. What I said was that introverts are capable of overcoming their tendencies. They're tendencies, not fate.
The commenter a few levels above said they had a great time at parties; the comment I responded to said that sounded like a shy extrovert. Not so, say I: introverts can have fun at parties too, even ones where they don't know anybody.
No value judgement intended in any direction. I'm a strong introvert who does well at parties because I need to for my work; but it's difficult and I don't have fun.
I think the person above was pointing out that by saying that introverts need to "overcome" their tendencies, you are effectively saying that introverts have an issue that needs to be overcome.
I just moved overseas to a new university and I've been forcing myself to go to many, many talks and chat with the people there. Some huge proportion of time I walk away with some useful bit of information "You have to read the new paper by x! It covers exactly what you're looking for." or "Y just got a grant and is looking for PhD students in your area."
Every connection you make adds potential access to another life times experience and knowledge.
[I'm vaguely expecting you to weasle word "Ah, but not doing that is being an /extreme/ introvert."]
"Introverts are perfectly capable of overcoming their personality tendencies."
The first thing you're assuming is that introverts either want or need to overcome their introversion. There isn't anything wrong with being an introvert. There is something wrong with being an extreme introvert.