Why are parishes in the Archdiocese of Detroit being separately incorporated?

According to Canon law (church law) and Church teaching, each parish and diocese has its own unique set of rights and responsibilities, including the obligation to administer church property. The separate incorporation of parishes is the civil law structure that most accurately reflects our ecclesiastical law and theology. Creating non-profit parish corporations is the simplest and most effective way of ensuring that the rights of parishes regarding church property are respected not only in church law, but in civil law.