A perfect example of how little is put towards making rules is how one state or province says you can watch 8 infants or toddlers, while another says the limit is 2. What's the difference? Are DCPs in one state or province better than the ones in the other?
There are so many differences between different areas, and even among counties. Wouldn't it make more sense for them all to get together, figure out what it really should be, then make minor variations if they want.