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I think the "intervention" you get when using the press-and-hold method is limited to diff assist. The diff can "go open" under certain conditions and the system applies some braking force to the inside wheel to get the diff to work.
Our diffs will act like an open diff if one of the tires is lifted or "unloads" enough. With the pedal dance it goes open until the unloaded tire has enough resistance. The press-and-hold method allows the system to jump in and "fix" the problem when it happens.
Having experienced both situations, (my Z's Quaife diff went open sometimes and had no electronics to bail it out) I don't think the diff-assist works all that well for performance driving, but a helical diff is usless when it goes open anyway.
The few times the diff assist has done its thing, I *think I would have been a little better off if it had just gone open and recoverd without any intervention, but it's so rare I don't think it's worth the pedal dance and loss of EBD.
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