I think (but I could be mistaken) that on certain underquilts that have these little D-rings at the edges, the purpose is to attach shock cord to the D-rings on each side of the hammock, and run the shock cord over the hammock ridgeline. I would think that would be very awkward, though, and especially for an underquilt with primary suspension, secondary suspension, and cinches at the end for draft control / venting... I can't imagine why anybody would want or need extra quilt suspension lines running over the hammock ridgeline.
Regarding attaching those D-rings directly to hooks on the hammock, I wouldn't ever want to do that, personally. Imagine if you accidentally sat in the underquilt instead of the hammock. The inelastic attachment of quilt D-rings to hooks on the hammock wouldn't stretch and it's very likely there would be some sort of failure of the underquilt fabric or stitching. At the very least, those D-rings would probably rip out. Suspending the quilt only by shock cord is a good insurance against that kind of problem.
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