I failed the question about remembering what colour my class definitions were, but you know what? I don’t care. All I want is for it to be visually distinct when I’m trying to parse a block of code

Between multiple IDEs, text editors, diff viewers and editors, and hosted tools like MR/review diff, they’re not even consistently just one thing. For me, very practically and factually. Colors differ.

As you point out, they’re entirely missing the point. What the colors are for and how they’re being used.