I think grandparent is talking about something else. Large C++ codebases often have a guide that says which parts of the language to use and not to use. That can be useful if you have a team with people with different levels of expertise in the language, or expertise in different parts of the language. C++ has grown to be a language with a lot of different parts to choose from.

And it looks like Python is heading in the same direction. It's not difficult to imagine a future where some Python projects are going to want such guides too.

Thanks for the clarification.

grandparent?

The parent comment of the parent of my comment, and by extension the writer of that comment.