Sounds like your reference is to the lack of fore-aft rigidity in the front suspension when the sway bar is out of the picture. And it's normal for a suspension like this one. Unlike in many setups the sway bar performs two functions in a D. The anti-roll function is the less important of those two functions with the primary one being that of a radius arm to the lower link. The upper control arm does the other half of that longitudinal location work.
This is one of the reasons that the condition of a D's crumple tube or subframe is important as well as the recall kit and proper fastening and locknuts/washers on the sway bar bushing mounts to the crumple tube.