It's important, I think, to distinguish clearly between sensitivity & infantilism, because, while they share many of the same downsides, the upsides are quite different. The main thing infantilism has to recommend it is that if you're willing to deal with it on its own terms, it doesn't require much thought.
The people who get the most mileage out of being sensitive are generally just infantile, highly differentiated & complex responses to reality just don't contribute much to getting mileage, all about tiny smidgens & such.
All very late 18th Century, I know, well, so what?
Listening to Germs.