Editing Toolbar for Markdown? just like Rich Text Editor

I still haven't completely understood the main difference between Rich Text Editor and Markdown, Although I have tried to read Docs as much as i can.

The markdown format disappears (For Example /**bold**/ is **bold** on markdown, when cursor is moved away from it), So why do people prefer Rich Text Editor?
If there are limitations to using Rich Text Editor, And It's basically Markdown under the hood, why not just remove it?

It's basically same thing, The Main difference is;

The Rich text editor has a fancy editing toolbar, Whereas markdown has very limited functionality on it's toolbar.

Coming from Obsidian, I loved that there was a plugin called "Editing Toolbar"

That helped us, weebs who know nothing about markdown, Still make markdown notes by just clicking on the editing toolbar and Boom, the format is applied.

Is there a limitation for providing editing toolbar for WYSIWYG editor but not Markdown editor?
is there a plugin out there for it?