To go back to your point of when policy items are voluntary versus mandatory, there is some research that has shown that the voluntary components of certain policies and legislation in the United States, compared with the mandatory elements, are not implemented quite as much. That's because there is the choice. When you have the choice, you have different competing priorities for the person on the front line implementing this. Things do fall through the cracks. When it's mandatory, that's when you know something is going to be implemented.
On April 1st, 2019. See this statement in context.