"And this does indeed...from an engineering perspective (having discussed this numerous time with my own PE I work with)... form a "triangulated system" of compressive resistance, which is the primary function of most of the working systems within the "oblique bracing" modalities"
I agree it is effectively a triangle, but there are ultimately four members involved instead of merely three, so I guess a trapezoid with one really short leg? One aspect of the design that has me thinking is the low buckling limit of such a long support on the side of the frame in compression --the longest leg of the structure is always in compression with this system. Granted, it only takes an intermediate support or two to mitigate the risk of crippling, and I suppose the compression load certainly does serve to strengthen the truss over a joint scheme that ideally only carries tension (whatever that may be)