Syntax highlighting is pretty redundant. Some interesting alternative uses of colour information are given at https://buttondown.email/hillelwayne/archive/syntax-highligh... (e.g. colouring different scopes, or different imports)

I also like the idea of using colour to distinguish different identifiers, e.g. https://wordsandbuttons.online/lexical_differential_highligh...

https://medium.com/@evnbr/coding-in-color-3a6db2743a1e

https://zwabel.wordpress.com/2009/01/08/c-ide-evolution-from...