I get all your points and they are good. I had never heard the phrase before and I interpret it differently. I interpret it as adults enjoying adulthood by finding moments to tap into our inner child.

This is a very short poem and brief explanation I wrote a couple of years ago. Embracing My Inner Child https://medium.com/know-thyself-heal-thyself/embracing-my-inner-child-a23ffdd1b09f with an adorable picture of me at about 1 yr I think