I should have taken more time wording that post I made. (my apologies)
The dyad is probably the best design for a modern multi-blade on the market, in terms of popularity, usefulness, and design elegance. I feel like it still leaves a fair amount to be desired though, when comparing it to all multi-blade styles.
I guess that when I look at all the current modern attempts to create these things, I always go back to the original multi-blades. They just seem more practical to me to actually use. How much can you add without taking something away? For example, by adding the spyderhole, you get two blades with one hand opening, but the ergonomics are negatively altered. By adding the locks, it makes opening and closing the knife more complicated, which reveals my clumsiness.
I would like to see more attempts to create a better modern multi-blade, I just have not seen one yet that makes me think my stockman is obsolete.