I truly enjoy the Notes feature as it allows us to consolidate most of the information in a single tool that our broader product / commercial team can easily access. However, I find that not having the ability to include a table of contents at the top of a note is a real limitation. We can certainly consider nesting notes, etc. but it is not the most practical approach as it requires readers to constantly switch between notes. We use confluence extensively for internal communication (with the engineering team) and we rely heavily on table of contents there to make the content easier to navigate / digest and it is effective.
Now you can add a table of contents to long-form content in the Aha! text editor.