Somewhat similar to putting up a sign that says “SPEED LIMIT” without any number given.
Each police officer could simply decide what the speed limit is at any given time even change it from one person to the next.
The fact the ACA “law” can be changed from day to day is what makes it unconstitutional.
There is no way anyone knows from day to day what the “law” is.
What you can do one day you can’t the next but you can the day after that.
There was a TED talk that defined the toolkit for prosperity. The requirements were rule of law for everyone, minimal corruption, property ownership.
If you didn’t know what the law was day to day, it was easy to extort and abuse people. Corruption was a tax on the poor. A lack of documentation and registration to let people own the buildings they lived in and land they farmed prevented investment in that property or the ability to mortgage it to get more productive equipment.
A “the law is whatever the President wants to enforce” ruling is the exact opposite of what enabled our prosperity.