Perhaps:
4. Further Considerations
Occasionally the IETF may choose to publish as Proposed Standard a
document that contains areas of known limitations or challenges. In
such cases any known issues with the document will be clearly and
prominently communicated in the document, for example in the
abstract, the introduction, or a separate section or statement.
Seems reasonable to me.
I agree; that's a fine way to put it, and thanks.
Barry