In the same problem, the org-mode address list was.
A few suggestions, but in the end, the need for simplicity and compatibility with LaTeX, DocBook, and traditional book / article structures seems more important than the ability to continue content after subtitles.
In addition, the continuation of the content after the end of the subheading section is generally not obvious to the reader.
One suggested workaround is to use lists as sub-content. This is quite obvious in the markup, as well as for the reader.
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