Even ignoring diagrams, etc, there's a reason that like word processing applications are killer apps for personal computing. WYSIWYG is a pretty convincing abstraction!

And yeah, you have the invisible format issue but at least you can make tables and resize them with your mouse.

Markdown's value add comes from having really good implementations to transform it into rich text, and being "unambiguous" (it's not really in a lot of cases but there aren't many great alternatives with widespread implementation).

But like... Word is pretty magical overall.