It just means that because this is a federal requirement that needs to be implemented by the states, we're going to see 50 different implementations. Some will work better than others.
Why is it so hard to just travel with a passport or passport card?
HN is overwhelmingly technical, educated, well-off, and travels a lot -- most of the US (and other places, for that matter) aren't.
See also: https://www.forbes.com/sites/lealane/2019/05/02/percentage-o...