Last time I didn't have any syntax highlighting while coding, it was C64 BASIC, and I was 10. I have generally seen my code improve and my errors be easier to find as the degree of syntax assist tooling I've used has increased. Today, I use (all hooked into Atom) prettier, eslint, and syntax highlighting (Nord theme)... Not a whole lot of syntax errors go undetected.
So to me, this would be catastrophic advice.
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