I'm with you on that, I can think of one counter example though, and that is when you have to write your MD in something like VS Code. Which uses the old-fashioned approach of source code pane and render pane. I strongly dislike that and usually try to get away with source-code view only. To be fair, they use a tiny bit of coloring, so it's not 100% plain text. And the better solution is to write your MD in any other MD editor except VSC, of course.