I'm just giving you a hard time!
Hell, with ¾" plate you might as well not have any suspension anyway. The unsprung weight would be so high that he control arm wouldn't be able to overcome its own inertia to respond to bumps. It would be a terrible ride. Even the ³/₁₆" plate adds quite a bit of unsprung weight, and it's probably the reason the engineers don't box it in the first place...well, that, and to save time on production. The time is the reason we have stamped UCA's and LCA's, instead of tubular, from the factory. The materials cost about the same, but the tubular would take more time to produce, and time is money, et cetera...