People tend to claim that, but I disagree ... once you try your hand at action painting or other styles of abstract expressionism, you'll notice that it by no means "easy" ... sure, it's not the same thing as painting like Bob Ross or the painters of the olden days, but to create a lively, polyfocal surface that's not just a gray, nondescript mess, is a skill of it's own.
It's not random noise (and I'd say if you think it is you need to train your senses better) ... if you've actually seen a Pollock "in the canvas", there's so many tiny little structures and details to discover, there's typically a balance of colors, structures, and densities. Fairly complex paintings, phenomenologically speaking.