As George says, it's most useful for tabletop work to avoid potentially tail-chasing situations where you have the camera rail tilted and are using rear swing and then need to recompose to compensate for the swing, and then need to adjust the swing to compensate for the recomposition, and then you need to rotate the camera to adjust for the yaw, but then the swing and tilt are out of whack, lather, rinse, repeat...
Otherwise, if you generally keep the rail level and don't swing the back when the rail or base of the camera is tilted, you won't need this feature.