Indeed. It’s not noise and never was noise. It was noise to experimenters who were attempting to focus on a particular pathway, as if the brain was hard-wired circuits. And that method is useful and we have and continue to learn a lot that way.
But the brain isn’t a giant circuitboard in the way our computers are.
It’s more like balancing a pile of toothpicks in the shape of the internet all interconnected with gears at the tips connected to other toothpicks, constantly changing shape.