Originally Posted by Chip

Because on a road car for comfort you want to be getting some of your total roll resistance from an ARB so that your springs dont have to be so hard.
If you remove the ARB, to get the same roll resistance you had before you need to go up on spring rates.
If you have all your roll resistance in the springs it will FEEL great as the car will turn in so well, but ultimately you are likely to compromise on overall grip.
Its one of those funny situations where what feels best isnt always what actually is when you look at your ability in terms of ultimate corner speed.

One thing I totally agree with though from the OP is that compression struts under braking in a straight line are great.