Using the spread operator multiple times in JavaScript

Why can't the spread operator be used multiple times?

let arr = [[[1, 2, 3]]];

console.log(arr); // Array [[[1, 2, 3]]]
console.log(...arr); // Array [[1, 2, 3]]
console.log(...(...arr));
// Uncaught SyntaxError: Unexpected token '...'

I had expected :

console.log(...(...arr)); // Array [1, 2, 3]

Why can't spread operator be used multiple times?

... is not an operator. (...arr) is not valid JavaScript. ... is only allowed inside array literals and in arguments lists, but those are special forms of the syntax (notice the ... in the production rules below).

ArrayLiteral

ArrayLiteral :
  [ Elision_opt ]
  [ ElementList ]
  [ ElementList , Elision_opt ]

ElementList :
  Elision_opt SpreadElement
  ElementList , Elision_opt SpreadElement

SpreadElement:
  ... AssignmentExpression

Arguments

Arguments :
  ( )
  ( ArgumentList )

ArgumentList :
  AssignmentExpression
  ... AssignmentExpression
  ArgumentList , AssignmentExpression
  ArgumentList , ... AssignmentExpression