The U.S Constitution gives such a broad outline of the federal rights and was written to infact have a lot of broad interpretation. It's difficult to write a single document bound to every state over such a large area. This is where the 10th amendment of the U.S constitution comes in, gives the states and the people their own rights that aren't specified allowing States to created their own state constitution dealing with more indepth issues for their specific area without affecting other states that may not have the same issues
The major advantage is that the states have their own right to choose which laws will apply to them and in what way, based on their own interpretation of the laws.
