Hmm. Fair. Though I think this is more a limitation of metal working techniques than the material itself. Composites, after all, only opened up as an option for weight bearing structures after different techniques to work them were invented.Not true, one way to deploy the advantage of composites is to pocket the weight saving, but equally you can use it to enable shaping which would be weight-prohibitive in metallic structures. Take a look at the aspect ratio of the MS-21 wing, indicating it's aiming not so much for weight reduction rather than lower induced drag.