The answer isn't the animation quality—though that is world-class. It is

The water in Finding Nemo wasn't just water; it was the terrifying, beautiful vastness of a father’s anxiety. The abstract, shifting geometries in Soul (The You Seminar) weren't just trippy visuals; they were a visual representation of pre-birth consciousness. What is the single thread running through Ratatouille , Inside Out , and Turning Red ?

And in that medium, a cartoon fish can teach you more about parenting than a live-action dad ever could.