This is an interesting analysis. I don't really know why the prince is most read and has profound impact to children and adult but I guess, there are always so much to learn behind the symbolism that this story has.
This and Doña Bárbara, are the analyses that I have enjoyed the most, but The Little Prince brings together a set of reflections for each value that is addressed in the story, and delves into each of these, leaving traces, I think that's why it has so much impact. Each character in the story leaves a strong impression by their actions, and a great learning as well.