On the other hand, the contextual updates it enforces will not enable it to deal with the following (constructed) variant on 4, in other words does not afford responders to comment on previous responders, as opposed to the original querier: One arguable problem with this protocol-equally applicable to the corresponding DRed grounding protocol-is that it licences long distance acceptance and is, thus, inconsistent with the MAG benchmark.
it is potentially useful for interactions where there is explicitly more than one direct addressee.