Well as you say, if a wishbone is hit backward you want the a 'brace' to stops the pins opening at the front so a brace would be in tension and at the rear in compression to stop the pins closing. As long as a car it designed to with stand the forces there is no problem.
On the X6 the whole of the thick part of the chassis where the pivot pin mounts screw in are across the front of the pins and the existing rear toe in mount/brace has now been beefed up over what it was originally.
Does that answer your quesion?
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