Preschool TV is this interesting place. So many showrunners put alot of academic analysis on how children learn. To inform how they make their show. Or, in some cases, exploit that toddlers have 0% media literacy. And cant resist forms of visual manipulation. With all of this formula and academic study, does art still bubble up? Well of course. Even the most manipulative ones have some amount of creativity outside the formula. An actual story can form away from the studies-informed structure. Otherwise they would be YT toddler slop, or Daniel Tiger reading cold essays with simple terminology. ...I mean, little words.
And if art can still grow out of the formula and structure, then there may be some depth in there. This ~can~ happen with any form of art. A silly cartoon about cartoon characters living in a virtual circus can be about complex themes of dysphoria, avoidance, emotional regulation, and egos past infinity. If a human is pouring their heart and soul into lessons about numbers, or how to give a neighbor back their stuff, some of that person's depth can transfer into the work.
I think preschool shows -try- not to be too deep. Cause if you try to hard to be deep, it either: 1) is wasted effort as a toddler might not pick up on most or any of it. And 2) it might overwhelm to tears or confusion. But, this doesnt mean the shows dont have any depth. Big Bird learning that Mr Hooper died is dripping in meaning, and is one of the most touching bits of television. And it's made for preschoolers.
So I believe it is possible. And is avoided. But just because we try not to overwhelm preschoolers, isnt an excuse to talk down to them (there's a difference). And, to deprive them of the depths they can handle, or need to learn to handle, is kinda unfair to them as people.