So, just to be sure, what are comments exactly?
What's the guideline to use the ML vs. a comment?
I don't think we're really trying to be that regimented about it. We will field feedback however it comes in, and direct traffic as needed.
As a general guideline, comments on the spec would be something the falls into the category of a technical review. Perhaps we used the incorrect terminology or the proposed scope is too broad or narrow, or we're missing something vital. If you have general questions and concerns, and just need to talk it out, then the mailinglist might serve as a better forum.