I don't agree with that, though I do agree with your analysis of what RBR are doing. If Ferrari or McLaren could do what RBR do they'd be doing it and adapt the rest of the car accordingly. I think the other teams simply don't have the expertise at the moment to lay the carbon fibre in a way that would not flex at all up to a certain load then flex predictably at greater loads. Thats not to say they won't catch up of course and I bet members of the RBR carbon fibre department are getting regular job offers right now.