In the Voronoi Fracture node there is an option to check Copy Cell Point Attributes.

What is this for and how would it be used?

you can use it to copy attribtues from your second input points to the corresponding pieces
like if you have a custom index you want to later use to match piece to corresponding point, or simply just want to transfer any attribs

the dropdown menu may not list correct attributes (probably a bug of Attribute Copy SOP used internally which seems to list first input attribs instead of second), but you can type them in