In the simplest terms...
On a conventional 3 link, as you move the top link down in the front, creates more forward bite on accelleration. The further you move it down and forward bite increases, it effects corner entry (decelleration) making the car loose. So you are limited to how much forward bite you can put in a conventional 3 link.
By adding the top bar (decel link) in a decoupled 3 link, you can tune/maximize forward bite/grip with the accel link (bottom link) and not have the loose problem since the top bar is controlling decelleration/corner entry.
Ron Sutton can explain it way better than I can, but that is it in a nutshell
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