I think it is the material strength that is changing theoretically more flex = more mechanical grip as the wishbones allow the wheel to stay in contact with the ground for longer by allowing the wheel to move over small bumps and ruts that spring and damper won't move for.
But the downside is that it slows ablity of the chassis to change direction because the wishbone is moving /compressing under load instead of transferring the force to the wheel.
But it may be the BMAX II short wishbones which apparently narrow the rear track and allow more weight transfer to the front.
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