I've also gone through the same process of being a strong introvert and learning to be more sociable. And I thought that was a really excellent application of the idea of the growth mindset for the article to point out. But I've gotta take issue with the idea that learning to be sociable is the same as learning to be an extrovert. It's just learning good social skills and learning to enjoy using them despite being an introvert.
I'm pretty well convinced that introversion vs. extroversion is just a part of everyone's neural anatomy, as much as being right-handed or left-handed is. That is somewhat plastic, but it takes fantastic levels of effort to fundamentally change. In/extroversion is a matter of how you think and what drains or recharges your mental energy, not how good you are at interacting in social groups; those things happen to be correlated, but there are some really awkward extroverts as well as really sociable introverts.
I believe you have pinpointed the issue here. I learned to be more sociable and I'm still introvert. Making the distinction is important. Thank you.
But while having transitions, sometimes I really became extrovert. Mostly I like to hold my issues to myself. But sometimes - with the help of booze - letting go of my thoughts is easier.
I'm pretty well convinced that introversion vs. extroversion is just a part of everyone's neural anatomy, as much as being right-handed or left-handed is. That is somewhat plastic, but it takes fantastic levels of effort to fundamentally change. In/extroversion is a matter of how you think and what drains or recharges your mental energy, not how good you are at interacting in social groups; those things happen to be correlated, but there are some really awkward extroverts as well as really sociable introverts.