You could say the same about C. Sure, the C standard library is specified along with the language, but it's still a library, not a set of language features. You could have C without the stdlib. So does that mean an example in C with an alternative IO library would be ok, but not a similar example in Python?
I don't think whether IO is built into a language is really the important question. If people are interested in seeing how IO works with different frameworks, those examples should be there. But if people just want to see what a language's basic syntax looks like, not the specifics of emitting IO in various frameworks, there should be one example per language, even for languages which lack built-in IO.
