MMmmmmm. Crow for breakfast today.
The decision to add Atom support was brought about by philisophical reasoning and a desire for consistency. Vine Type is a content management system built with standards in mind. How could Vine Type ignore Atom as the de jure standard for syndication?
So Vine Type v1.2 (active on this site right now and launching soon) will support an all-comments feed, an all-comments feed mainly for site owners, and individual article comment feeds for folks wanting to subscribe to a single article's comment thread.