What would court case be like if none of the Justices ever spoke? Would it just be two sides giving their arguments, witness, and closing arguments? Seems like that would speed things along. But when is communication every 100% concise? Still seems suspicious to me.
Would it even speed things along? The oral argument part of SCOTUS cases takes way less time than the months of deliberation before they reach a verdict. And for the attorneys involved (many of whom are arguing the biggest and most important case of their lives, sometimes with the future of a huge issue hanging in the balance) I imagine they care a great deal about being able to clear up any questions or confusions the justices may have, even at the expense of a few more days (or even weeks) in court.
Clearly every human can't be on the beach at once. But all of the Justices can remain silent. What point are you trying to make? Maybe offer a context?