It's probably only me but isn't Markdown's main "selling point"/feature the raw files are human readable?

Looking at the screenshots, the only thing the "rendering" provides seem to be: 1) syntax highlights on code blocks; and 2) don't need to count the ordered bullets?

I guess if you need to verify that your markdown can be rendered (e.g no syntax errors), this would be helpful, but for that use case maybe a markdown linter is better?