The only interesting point they make to chew on is that holding a physical object might help people forge stronger bonds with an these artifacts. However, the people most likely to be impacted by this is small children - the same ones that put things in their mouths. Montessori schools are all about manipulatable objects, ideally made of natural materials like wood.
I dunno, this seems noble enough and I don't want to shit on such a clever project. I just fret that 3D printed objects are expensive, breakable, likely to be stolen (accidentally or otherwise) and well, I can't help but feel like all of this is going to end up on the same garbage ship to Liberia some day.
Please, bring me to the other side! I want to love this.