There is a significant advantage to adding them. The additional rigidity that connectors add to the frame not only help put power down but they firm up the uni-body to such a degree that doors will open and close easier, panel alignment will remain more consistant, squeaks and rattles will disappear, window weatherstriping will seal better, and of course the suspension will be able to better respond as it is intended. When the body becomes and activate participant in the suspension equation, no good can come of it.
Look at it this way, a unibody is put together with thousands of spot welds. That is like wearing clothes that are only held together with buttons. They allow flex which can lead to gaps, which will do either one a disservice.
