...depicting the symptoms is just one part of understanding the topic, while actually showing us how to overcome them is a whole other beast, and that's where I have no faith in the author's ability or, indeed, willingness to execute. I have already expressed in this thread my discomfort at the apparent mixed messaging of this manga, where we are seemingly expected to root for Neeko on one page, but to point our fingers and to laugh at her illness on the other. That is what makes me think the story will never reach a satisfying conclusion.
Arguably, as I've taken a day or two to think it over, that may be the point of this series. Depicting Neeko's relapses and outbursts with such genuine emotion and accuracy means the author definitely has a degree of familiarity. Whether it's off hand knowledge from an acquaintence who was actually willing to share their experience, or they have personal experience with the subject is both unknown and unnecessary. What matters is that I have full confidence that Neeko's plight is genuine.
That said, there is a dilemma inherent to depicting severe social anxiety so accurately.
On one hand, Neeko is a fictional character in a fictional setting that we emphasize with and we want to see improve and get better. On the other, anyone experiencing the same things Neeko is knows that if it were that easy to solve they probably would have done it by now, and if she were to quickly and suddenly get better out of nowhere it would be disrespectful to the people who are actually suffering.
There's a delicate balance and the author is really towing that line. The times where Neeko's dysfunction is treated like a "joke" doesn't actually feel disrespectful to me, at least, not totally. It's just accurate to how most people are treated. If it makes you feel uncomfortable, it's supposed to. Neeko is misunderstood and that's fine. The author is making a point that this is Neeko's life and this is what people feel.
My personal issue, and I hate taking about myself and do it rarely online, I'm only using myself as an example, is that Neeko is too empathetic to me. Her life almost feels like I'm reading a personal biography (with some notable exceptions, of course. I'm not a cute anime girl living in Japan, for one.)
While I'm glad a peice of media exists that helps others understand what people like me are going through, it's really hard to continue reading and remind myself of my own issues constantly.