I just wanted to point out that Oral B’s basic electric toothbrushes still range from $45-$80, so it’s not quite as cheap as you say it is. Your point still stands in its entirety. The only thing that makes this product different from the $45 model is the Alexa functionality, and taking that away makes it effectively not the same product.
I like to imagine that the childbots are made in the image of the parentbots, and the childbots eventually are tasked with picking out preferred larger parts as a growing rite.