Because the parameters to zip aren't positional, they are just multiple parameters of the same type.

Python does have some that annoy me a bit. I think str.join would be clearer as a function, but at least that does have a positional parameter.

>Because the parameters to zip aren't positional, they are just multiple parameters of the same type.

How is that a counter-argument? It makes sense then that the method belongs to that type (iteratables).