in the past, we did do the Dolby Theater tour during the
ABD, I believe it was the first time I went on it (I've been on the ABD tour 3 times). we also spent quite a bit of time on that stairway going over the history of the oscars. I am not sure why they dropped it. I also am not sure if it was identical to the tour that you could do yourself directly, since I have never done that tour. There were a few things we did on that first tour, that were not done again on the 2nd or 3rd (example, going in the 1901 lounge in carthay circle, doing a behind the scenes at Soarin' including getting a chance to smell up close all the scents, have a behind the scenes of where they launch the fireworks including chatting with one of the pyro guys, going to the wax museum at night in hollywood (ok, this one wasn't great)).
On an interesting note, every time we have gone to the Jim Henson studios specifically, although maybe 70% of the tour was going over the same places or doing the same things there, each time we got to visit a different section of the studio, so each time it was different. No matter what we saw, it was always a highlight of the tour.