Smalltalk seems to be sufficiently niche that even StackOverflow doesn't have syntax highlighting! E.g. http://t.co/DVIkiIBvgn
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Over a sufficiently long time horizon, all code you write is legacy code.
I've added syntax highlighting to the prompt of my programming language!
It's not strictly necessary, but it's nice to have. It caught a bug with lexing incomplete string literals too.
The niche of short, environment-specific scripts, and the consequences for programming language design choices: https://brrt-to-the-future.blogspot.com/2021/03/why-bother-with-scripting.html