Welcome!
I think generally it is assumed that Rich Text will be a long page and contain all sort of things. So showing it and having it editable within a single cell would then be a subpar experience. Indeed, if people use a rich text field just for quick short bullet points, having it inside a cell could be nice.
How are you using the Rich Text? What’s the use case you have where its easier to edit directly in the table than opening the entity? Where does the normal Text field fall short?
I think this is somewhat related, but the other way around (adding more function to the standard text field): Render Text Formula Output as Markdown Optionally