I don’t see why not, as long as you make it clear what it is. E.g., if a C API is handing me an opaque handle that I need to pass around to the rest of the API,

I don’t see why not, as long as you make it clear what it is. E.g., if a C API is handing me an opaque handle that I need to pass around to the rest of the API, I don’t need to know that it’s a pointer (I’m not the one dereferencing it) and I’d rather not have to worry about that if I’m using the API properly.