It's not to dismiss the innovation, but rather point out that it's a lot less new than people think which has the very important consequence that we already know a lot of its weaknesses. People assume because cryptocurrencies are new, they are entirely untested and hence could be a remarkable solution, but in the end they are often a sum of some very old parts that have been tested for a long-time and we already know the limitations and could easily identify whether or not it will work before even trying.