Quote from Bob Smith :

Possibly, yes, but I was ignoring weight transfer by body roll and tyre load sensitivity there. Anti-roll bars only affect grip during single wheel bump situations and only then because of the affect on camber. On a perfectly flat track (e.g. autocross arena) you could have infinitely stiff ARBs without negative effects.

That´s not what i meant though. (actually rereading your post properly it was seeing as you alluded to ignoring load sensitivity)
Imagine a car with the roll stiffness at both ends tuned perfectly for neutral steady state cornering at the limit like on a skid pad. Now if you were to stiffen the ARB at one end you´d lower the available grip at that axle, thus pushing the balance torwards over or understeer (I know so far I´ve said nothing you didn´t know anyway).
If I´m not mistaken the net result of this would be, that the upper threshold for any neutral steady state cornering is lower than it was before, or in other words the maximum achievable cornering force is lowered which in turn means the maximum overall weight shift is lower than on the neutral car.

Shotglass - correct of course.

Tristan - with load transfer and camber sensitivity taken into account, ARBs make a huge difference. I was not saying that. Their main downside comes from single wheel bump situations, which don't exist on flat tracks. Not sure where the confusion comes from.

Ah - I think I may have read your post in isolation. For a minute I thought everything I knew about ARBs was wrong!