Many people are just more comfortable using WYSIWYG application. For them, it's easier to use preset templates and to apply formatting by highlighting, pointing

Many people are just more comfortable using WYSIWYG application. For them, it's easier to use preset templates and to apply formatting by highlighting, pointing, and clicking. And those WYISIWYG tools enable them to easily create more complex formats and add tables and graphics to documents, to share those documents, and to convert documents to PDF or HTML. The people who use those applications don't need to fiddle about with markup languages. Many of them don't want to learn markup languages (no matter how easy you might believe they are to learn). There's nothing wrong with that. Plain text has its place and its user base. That user base isn't just technical people, either. WYSIWYG tools have their place, too.