The very concept of protection zones is to bring laws together. The laws would be to protect waters, so in my mind there must be a connection to water or sources of water to protect those waters and an alignment of laws.
I'm not sure if I totally get the question, but I don't think it's limiting. I think it is talking about the definition of “law” in a space and that a first nation must be implicated in that space in order to define laws in partnership with provinces and territories. I think it strengthens the nuance of the law-making ability that a first nation would have.