A separate comment so you can downvote this one. Have you ever written about the link between HSP and autism? I couldn't find this topic using the search box. And how is it going with scientific recognition of high sensitivity as a personality trait?

I have mixed feelings about the HSP concept, because it filled a gap at a time when autism was underdiagnosed. I feel betrayed by doctors who claimed that autists didn't feel empathy - because I felt too much to do anything useful with it. Nothing made me understand myself better than diagnosing myself as autistic. There are more traits and correlations I recognized than just the diagnostic criteria, from IBS to indifference about certain gender norms.

I read your post differentiating HSP from introversion, shyness and social anxiety. I could write pretty much the same about autism. The medical community moved towards defining one autistic spectrum, where Asperger's isn't seen as a separate condition anymore. High sensitivity could be one end of the spectrum then. I would explain the many different symptoms of autism as unconscious coping strategies for dealing with overstimulation. The main difference I see here within the autistic community is between seeking or avoiding a structured life. Some insensitivity might play a role too, e.g. ignoring social cues, but I think this is overestimated.