constraining author use headings to indicate subheadings, subtitles, alternative titles and taglines

hi all,

the following text was recently added to the spec as a note [1]:

"Note: Do not use h1–h6 elements to markup subheadings, subtitles,
alternative titles and taglines unless they are intended to be the heading
for a new section or subsection."

feedback has been submitted [2] that suggests the wording is unclear and
the intent is unclear (is it advice or a requirement?)

My thoughts are that the text should be recast as an author requirement:

"Authors must not use h1–h6 elements to markup subheadings, subtitles,
alternative titles and taglines unless they are intended to be the heading
for a new section or subsection."

comments and feedback welcome!

[1] http://www.w3.org/html/wg/drafts/html/master/common-idioms.html#sub-head

[2] https://www.w3.org/Bugs/Public/show_bug.cgi?id=21920
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Regards

SteveF
HTML 5.1 <http://www.w3.org/html/wg/drafts/html/master/>