I would appreciate this if more front-end specialists actually had all four of the skills that the author claims separates them from full-stack devs: elegant CS

I would appreciate this if more front-end specialists actually had all four of the skills that the author claims separates them from full-stack devs: elegant CSS, high-performance web engineering, accessible markup, and in-depth knowledge of React/Angular/etc. I've not observed this to be true. All too often a person only knows the JS framework and doesn't know/care about any other aspect of their platform.