Hey Nick, I'm glad to hear about that you are in the Word team:)
I'm working on a document manager and static site builder based on Mirosoft Word (https://docxmanager.com/) (The upcoming version will have a more user-friendly tabbed UI)
Started creating a custom text editor, then I ran into all kinds of weird difficulties like the original article mentions.
Ended up integrating Notepad++, like you integrate Word.