Not true. Consider the following snippet -

    a = 10
    b = function() { return expensive_computation(a) }

Now, even if you can call b without parens, it still has to redo the expensive calculation every time you access it (because a might have changed... even if it hasn't).

The "destiny" operator is more like

    a = 10
    b = function() {
            persistent cached_value = null
            if is_null(cached_value) or has_changed(a) {
                cached_value = expensive_computation(a)
            }
            return cached_value
        }

but instead of that, you get to write (in this totally fictional programming language)

    a = 10
    b <- expensive_computation(a)

and have the compiler take care of the caching and updating for you.