Honestly have no idea what you’re trying to say here … the point of governmental power and law is arguably not to be optional.
If the Supreme Court has the final and unreviewable power to decides what the law means, and their proclamations are simply followed without question by the Executive, then they're not optional in any way and they have ultimate power under our system of rules. Congress can make new rules that the Supreme Court can declare unconstitutional or twist to their viewpoints, the executive can take action that is then declared unconstitutional.
The only Constitutional restriction on them is impeachment and removal, but they're the people who decide how the Constitution works. And impeachment is basically an irrelevant fantasy. The actual check is what's not given to them. All they can do is publish words, which are supposed to be followed but which they don't have any actual power or money to force into being without cooperation. But if your not willing to consider that an executive might at some time be right in saying "no", then they are effectively all powerful.
That's the "optional" part. Requiring some dupe to bring a case is trivial, it doesn't make them optional, it's that their power can be vetoed by simply being ignored. And it's a power that needs to be held over them the further they stray into being an entirely political body.