I 100% agree with the paper. However, one should not mistake historical contributions with state of the art needed today. Unix and C are still largely relevant

I 100% agree with the paper. However, one should not mistake historical contributions with state of the art needed today. Unix and C are still largely relevant and will continue to be so for a long time, even more so their legacy, but one should not interpret that as if nothing better is needed now. For Unix derivatives, well they evolved and are already largely not the same thing as the historical versions. For the C programming language, it is a way more complicated situation. Of course it evolved too, but I would say not as much, especially in areas (safety) where we now have pressent needs. C has contributed greatly to the world and will continue so. But don't forget that so does Cobol.