Yeah, this is just some purist BS in my opinion.

Message / medium have always mixed together.

Even folks who say content needs to be figured out before presentation... it's not so cut and dry. Your medium shapes your message - they are not mutually exclusive and for the receiver of the message, the medium matters for their reception of the message.

I understand the sentiment that TONS of CSS is probably a bad use of time. But trying to demonize or otherwise attach aesthetics the label of "meaningless" is, in my opinion, just as much egocentric as they claim CSS to be.