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That's said, I have attempted to make Emacs "render" am org file as if it were a word processor, things like making the headers larger than the underlying text, etc. See https://gitlab.com/howardabrams/hamacs/-/blob/main/ha-org-word-processor.org
For the second point, you might consider the use of imenu-list-smart-toggle, from imenu-list. Gives you an inline frame with all the headings in your current buffer, for org-mode and other modes too.
For table of content you can use treemacs. It's a very capable package and can do much more, especially for code projects.