I see where the author is coming from, but still this feels like a reinvention of commit trailers ("Acked-by", "Reviewed-by",...) especially for these non-blocking and "only appraising" comments. Commit trailers even have the benefit that they are recorded in the comment, making them discoverable and even allowing statistics, while "human language" comments are not that easy to do statistics on (modulo AI I guess, but that's another topic).