Wow I guess a lot of Pinside folks have never played a Gtb Haunted House. I mean, how could they? There's SEPARATE buttons for the upper/lower flippers!!! Way too confusing to figure that out man
Separate buttons isn't a new thing, it's just not the common setup, and probably has more to do with saving money on the parts than the fear of confusing the player.
Also, the ability to do staging isn't a "feature", it's a side effect of having 2 switches on 1 button. We use it to our advantage but having separate buttons makes way more sense from a human/machine interface aspect, just like left and right buttons for left/right flippers. Way more intuitive than having features on the lockdown bar button that's for sure. I'd love the ability to flip just the upper flipper on games with under flipper shots like WOZ, ST, etc.
And no I do not own a P3 nor have I ever played one - but I do have one on order for next year.