They're going to use a device anyways because mom or dad are going to want to avoid parenting. Might as well give them something designed for them.
Enabling the avoidance of parenting incentivizes parents who would otherwise be parenting to also avoid parenting. I agree with OP, hard to see how this is a good thing.
That's no reason to design devices that enable this parent behaviour. We should move in the other direction. Shaming parents who overly rely on giving kids devices for adults can be somewhat effective.
I know there's no hard leverage.