It depends for me. For my blog I have a web based editor, but one, that is just plain markdown with a preview. Similar to your described workflow. For a note taking app I decided to use WYSIWYG because I don't have the space for a split view and didn't want to just look at the markdown as is.

My main gripe with WYSIWYG is that they can get in your way. When I create a verbatim block and can't leave that block anymore (looking at you Teams). I guess thats also why I enjoyed LaTeX as much as I did.