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A swaybar (anti-roll bar) will always transfer some of the load to the outside tire.
The more roll you remove using it the more load you transfer from the inside to the outside tire.
Simply put, that reduces the cornering capability at that end of the car unless the resulting contact patch area is significantly enlarged by doing so BUT this should more effectively be cured by adding negative camber, increasing spring rate, etc. This is because the cornering force a tire can generate is not linear to it's load; i.e. you're better off having the load on your 2 tires on one end as close as 50-50 as possible.
However, swaybars provide for an easy way to adjust the balance of the car. A bit like playing with tire pressure. Some race cars can even have the swaybar stiffness adjusted by the driver as they race.
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