I don't think WYSIWYG is the issue here, WYSIWYG editors for markdown exist. It is the premise that document creation is about representing a piece of paper digitally.
For most documents nowadays it makes no sense to see them as a representation of physical paper. And the word paradigm of representing a document as a if it were a piece of paper is obsolete in many areas where it is still being used.
Ironically Atlassian, with confluence, is a large force pushing companies away from documents as a representation of paper.
For most content this is not the case. It is also obviously easier to go from a page agnostic format to a format which relies intrinsically on page size.
For most documents nowadays it makes no sense to see them as a representation of physical paper. And the word paradigm of representing a document as a if it were a piece of paper is obsolete in many areas where it is still being used.
Ironically Atlassian, with confluence, is a large force pushing companies away from documents as a representation of paper.