I’am still new to GHOST as a kinda Blogging CMS for me but i don’t support nor like the Idea of a native System for Comments implemented deeply within the Core. In my humble Opinion the Demand for this Functionality would be better solved as a Plugin or Add-On that can turned On/Off if necessary and works more like an Extra instead of a Component of the Core.
WordPress for Example has a build in System for Comments and it’s a Mess like the rest of it. I know that GHOST doesn’t work like WordPress and that’s a good Thing. So we should see GHOST as what it is and what it shouldn’t become, the next WordPress-Like-Thing.
GHOST is for Publishing, anything above that is Optional in my Opinion.