The XenForo "HEADING" tag is super primitive compared to VaultWiki's H tag:
- only supports H2 - H4
- very basic HTML. Makes it impossible to use for sections, so no collapsible, editable, etc.
It remains to be seen how the heading link will be implemented, but we can surely use the same FontAwesome icon for consistency and any associated UI.
It should also be possible to shoehorn ToC support into HEADING, unless something dramatic changes about the HEADING tag.