You don’t need to keep up with the joneses to write C++. The whole point with the language is that it’s for millions of lines of code that exist for decades and

You don’t need to keep up with the joneses to write C++. The whole point with the language is that it’s for millions of lines of code that exist for decades and you don’t update every line every time the standard is updated. Most existing code probably uses output streams with << operators, it’s good to know what that does.