I have this observation.... Everyone's neglect is different, some people's neglect actually helped them develop qualities that help them function well in society or even excel in life. For some people their neglect did not strip them of their identity or sense of self, maybe even made them defend it harder. Eg like they learned to believe in themselves because no one else would. Then there are people who learned through neglect on how to rely on themselves and work hard for everything they have. Also some people develop exceptional social skills from the neglect so they are amazing at making networks and gathering resources from people, others develop thick skin and a big temper so no one ever messes with them and nothing fazes them. Then....you have the people who keeping themselves small and their head down is the only thing that works for them. Have no needs, fulfil others wishes, never stand up for yourself... Is the only thing that kept them alive. Any sign of strength or wit will make things infinitely worse.
So yeah there you have it. It's all about what coping strategies worked for each individual to weather through the neglect. Which is why some neglected people do so well in life while others can't even function.