And you can’t play tennis with a metal racket, or a large one, or wearing anything other than white. :dubious:
Of course you could play tennis with any type of ball you want, if the rules allow it.
It might not provide the same satisfaction, but rules evolve. If it is woth doing, you can do it. I recommend it sometime if you have a racket you don’t mind destroying and a croquet ball 
Yeah I am sure if I go up to the hordes at my local Indian casino and ask them what the function of the wheel is, they will say “to provide random numbers, se it is right here in the rules”.
In fact, the numbers on the wheel are anything but random. In case you can find a drawing, they are probably exactly the same on every wheel (within tolerance).
If we are going to be epistemological about it, the device consisting of the wheel and the ball are meant to select a number randomly for the purposes of enabling betting.
Then, given that the rule is already there, how do you reconcile your view that the rules are not and can not be complete and consistent?
It is your opinion that it is fine. But I am far far FAR from being persuaded even though I am giving you lots of opportunity. Just on a hunch, did your Masters in computer science (or other education) cover topology at all?
That contradicts what you just said, that if you have a “let the ump decide” rule, you could close the rule set.

