Whoever thought that the idiomatic approach to "Hello, World!" in their language ought to involve using special overloaded operators as symbols to act on pipes must've been on something very strange.
https://stackoverflow.com/a/4854358/24817 is the canonical explanation for why >> and <<, apparently. Nearby, this is also mentioned:
> C’s printf family of functions is an effective and often convenient I/O mechanism. It is not, however, type safe or extensible to user− defined types (classes). Consequently, I started looking for a type safe, terse, extensible, and efficient alternative to the printf family. Part of the inspiration came from the last page and a half of the Ada Rationale [Ichbiah,1979], which is an argument that you cannot have a terse and type− safe I/O library without special language features to support it. I took that as a challenge. The result was the stream I/O library that was first implemented in 1984 and presented in [Stroustrup,1985].
and
> The stream I/O facility is implemented exclusively using language features available to every C++ programmer. Like C, C++ does not have any I/O facilities built into the language.
The language simply didn't have the advanced tools that ended up being used in more modern solutions yet. It was too early.