What are the advantages of using valueOf, toString, Symbol.toPrimitive?

Question

JavaScript

Why are there valueOf, toString, Symbol.toPrimitive, if it's easier and simpler to convert an object to the desired data type?
For example:

let a = {};
console.log(a); //объект --> string
a = +a; //объект --> number

Is it really necessary to always write these cumbersome constructions of object and symbol methods Symbol.toPrimitive? What exactly are their benefits?

let user = {
  name: "John",
  money: 1000,

  [Symbol.toPrimitive](hint) {
    alert(`hint: ${hint}`);
    return hint == "string" ? `{name: "${this.name}"}` : this.money;
  }
};
// демонстрация результатов преобразований:
alert(user); // hint: string -> {name: "John"}
alert(+user); // hint: number -> 1000
alert(user + 500); // hint: default -> 1500

Answer 1

You have some kind of porridge.
> if you can convert the object to the desired data type easier and simpler
So these methods will implicitly call the same `toString`, `valueOf` and `Symbol.toPrimitive`