I don't like WYSIWYG on the web. You do a long and tedious formatting of a forum post, then close the tab and it's all gone. I prefer to use a local text editor then Ctrl+V into web form. Which I can with markdown
I'm with you but many people do, simple is a side by side just like many html editors/markdown editors
Check out Linear, I'm not affiliated, just yesterday I happened to close the dialog by misclicking and when I pressed create issue again there was the wall of text I wrote. My point is it's not a technical problem but a product one.
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.
Any sites that have forms or editors that don't save your progress with localstorage need to leave the web and not come back.
I've seen this solved in some platforms with localstorage, so that it automatically saves your "draft" as you type and seamlessly restores it if you re-open the page. It was a really nice surprise the first time I experienced it (after closing a tab by mistake).