Not sure I follow there Peter. When I think of "robustness" I think of the extent to which the mounts are 'linear', rigid, close fitting, and transfer the forces between the rifle and scope without developing play over time, while equalizing as far as possible the load between front and rear rings/bases.
The offset front point of attachment also seems inherently unsound to my eye: the forces are multiplied by the leverage created by the offset of the front base. The front ring must have taken almost all the load at that point. Something else H&H avoided.
The designer of that 'hook and peg' system obviously believed that the bulk of the forces would be transferred through the rear ring and base it seems to me. The hook as made, does almost nothing to control the initial movement as it is open on the wrong side.