Perhaps "concise" is too strong. I think that anything can be made more verbose, either by adding redundancy, or just by explaining the same things but more laboriously, and the complete summary should be neither of those things. So I suppose what I'm looking for is the "minimal complete summary".
Yes - I hope this would avoid a problem where people who were against the RFC felt like their points were not being understood or not being heard because they were all going through the RFC author.