> But unfortunately these addresses are hard to remember and "nobody" recognizes them when reading examples.

How does that matter? The point isn't that the reader should know that "oh, this is a reserved address". The point is that there should be no room for the address that's actually being used by someone to end up being used incorrectly just because it showed up in some random documentation.

Much like how you probably wouldn't be thrilled if your phone number was used as an example in some random documentation somewhere.