According to my opinion the most important in a discussion like this ain`t if anyone has all the modifications (cause i think most of them are more or less helpful) but if there is a difference among similar products (for example apart from look and weight? which is the point on replacing a strut brace aluminum or even steel with a carbon when with the same money you get a lower arm+strut). Furthermore, when it comes to factors like body rigidity where there isn`t a very precise way of measuring it and even if you get, lets say, a feeling of a more tight and solid chassis i really dont think you can really feel the difference (except if you smash you car ) cause most of the times there is only a subtle change in absolute values for example g forces. Generally, speaking for some parts even if we don`t trust 100% other peoples opinions we can simply follow our logic and physics most of the times.