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Originally Posted by Dean
Once the front control arms go past level, the front suspension design causes camber to go positive very quickly...
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This is a bit of a misleading statement; angling the LCA's down towards the chassis is typically bad for handling, but not for the reason you're describing. The negative camber gain in bump does get smaller as you angle the LCA's down, but it is not an on/off switch like you make it sound. The wheel will still have negative camber gain in bump up to point where the LCA is perpendicular to the steering axis.
The dominant effect is the change in front view swing arm length, instant center locations and corresponding changes in roll center location & stability. These parameters are very sensitive to LCA angle. Changing the chassis pivot height even 1/2" can mean the difference between a stable roll center as the suspension articulates, and a roll center that swings wildly around outside the car as the instant centers pass through asymptotes.