Torque Box Question

Naturally, as one who doesn't have a large budget does, I have been spending a lot of time drooling over parts I can't afford but really want on the internet. I've done lots of browsing on the US Car Tool website and doing research on chassis reinforcement, and I keep thinking about the front torque boxes, both factory and aftermarket. Why aren't they triangulated to the torsion bar crossmember? I understand that the boxes still brace the floor of the car to the front frame rails for torsional rigidity, but wouldn't it be more effective if the torque box was a flat plate that covered the entire corner of the chassis? Theoretically, when the car twists it would put the flat face of the torque box in tension or compression between the outer corner by the firewall and the inner corner where the two frame members intersect, performing better. What do you all think?

For clarity, I am saying that the yellow part should extend all the way to the gray chassis member on the right:
USCT1M1503 (7) (Large).jpg