Your missing the point I think. GAs aren't new, same as neural networks which were thought up half a century ago. It's the finding that GAs work at such a scale

Your missing the point I think. GAs aren't new, same as neural networks which were thought up half a century ago. It's the finding that GAs work at such a scale, with 100 of layers and millions of nodes and even outperform SGD, that is of interest here.