For me body rigidity is always a necessity when a road car is fitted with racing tires. What most do not know, the rigidity improvement do not add understeer, it gives stiffer chassis. The car must be tuned to accommodate the added chassis stiffness and take advantage of it. I even added rigidity to race cars, and I never encountered one car that got slower in lap times due to body rigidity improvement.
I also understand that it's a preference, much like lower locking LSD ( low value that close to open diff ) and driving style mostly dictates if a driver will want to use it or not.
With body rigidity improvement installed, most road cars will have less body flex and roll, and can run slightly softer ARB and springs, but for racing tires, I always preferred stiffest possible springs while maintaining traction and control. I am currently doing research to build a 370Z GT4 NISMO replica, a base line build with high camber to replicate real life setup should do 2:15s at Silverstone GP on SS tire