> With CSS names are global.
In your "programmatic" code (your JS/TS, python, C++, whatever..) your classes are global. Even if the language supports flexible namespaces, or module scoping, you still have to take great care naming because reusing a name will cause you confusion. Giving two things the same name makes them harder to import, and risks clashes and bugs.
No-one complains about this. This is just how you code in all those other languages.
In "programmatic" code, declaring two classes with the same name in the same namespace is generally either some sort of syntax error or one will "shadow" the other; it doesn't just silently merge the behavior of both classes.