There's a difference between media meant for children, and media meant for families. I can't actually think of very many "classic" animated films that are specifically meant for children; most things targeted at children are generally reviled (see: Caillou), or at best tolerated (ex: Barney), because in targeting exclusively children, they usually give up anything even resembling a plot, or anything else of value to anyone over the age of 10. But the Oscars are notorious for having its members literally just ask their children what their favorite things were when it comes to voting for the animation categories, both on nominations and winners, so its not at all surprising that something where the dialog is nothing but platitudes was still nominated.