I have reviewed the document and myself have no issues with the technical content. However, IDnits post few issues that should be addressed, especially the downref. 
  == Missing Reference: 'RFC2119' is mentioned on line 29, but not defined
  == Missing Reference: 'RFC8174' is mentioned on line 29, but not defined
  ** Downref: Normative reference to an Informational RFC: RFC 4272