Too often the origins of cherished stories are not properly examined. In the following article, author Douglas Murray reviews J. M. Barrie & the Lost Boys, by Andrew Birkin, itself a "psychological thriller" according to a Time reviewer.
I was exposed to the Disney version as child, and as I consider it anew as an adult, am revisiting previous insights. If anything, Peter Pan is a warning—or should be read as one—as author's like JBP (link to YT) and others have duly noted.
It may be an awful thing to grow up, but what's the alternative?
Peter Pan is also known as The Boy Who Wouldn't Grow Up. I wonder if that title might more accurately have been: The Boy Who Wasn't Allowed to Grow Up. Maybe you can imagine others.