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It states right there in the description of the product what the joint is for: "It doesn't regulate a movement of a suspension in the length direction with keeping stiffness of a lateral direction." In other words, it allows the shock towers to flex upward (for absorbing harsh bumps on the road), but not inwards (such as when you're cornering hard). Which also explains why you don't see them on race-cars: there are no potholes, speed bumps, dead animals, etc... on a race track. This part is designed for real world driving.
And as loathe as I am to start up another "does it work, does it not" debate about strut-tower braces, all I can say is this: if you think they do not have an effect on the handling of a car (especially our twins), then you're spending too much time racing on paper and not enough time behind the wheel. Or, possibly, you're not pushing your car hard enough to see where such components come into effect... either or. Well made strut tower bars DO have an affect on handling.
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