I think you might be confusing the two different meanings of editor here.
1. Editor as in a complete program that is VScode and everything it entails.
2. Editor as in the actual text editing experience with syntax highlighting, code completion, etc.
You are likely thinking about the first type. Where the person you respond to is talking about the second one.
The experience of editing markdown in VScode is a very pleasant one so I can see why people would want that editing experience in other markdown based note apps.
