We value quality over quantity. You may have noticed comment fields are undergoing a bit of turbulence these days. We are of the opinion that “drive-by comments” promote low quality discussion, therefore we are unlikely to ever have built-in support for that in our canonical products.
I don’t think combining Discourse comments with other comment solutions is a good idea. Either use Discourse or a different comments system altogether. If you prefer something forum-like, Muut is pretty good.