Why weight on B4 / B4.1 ?

[Lonestar]

Hi guys

This is likely a dumb question... I am still struggling to understand why it matters so much to add ballast to the B4 / B4.1... Trishbits, ghea, AE's newly released ballast, 1:1 wheel balancing leads, everyone seems to be doing it.

One stupid Q - why? What can weight achieve that setup can't? Obviously mass repartition. But then why does every one add weight all over the car? And for those adding weight only at one end, what does this achieve handling-wise (not just static-scale-wise) that setup changes like shocks/springs/wheelbase can't do???

Thanks... Sorry, not much of an expert on car setup... I can drive it (almost) properly but can't setup a car to save my life

Paul