Hi,
40 years ago, seeing TD live was the thing .. why? No two days would have them sounding the same, and the massive number of the bootlegs is what eventually allowed TD to release their live concerts and sell them, and they were better than the bootlegs, of course.
As time went buy, these things changed. I love (for example), 220 Volt Live, and there really is not as much separation between the live and studio material anymore ... and the quality still stands up. With "The Sorcerer", I think that TD was trying to raise the platform ... that live, was the ultimate because it could not be repeated anywhere else exactly like it ... right or wrong. It was a way, I think to show people that creating music right there, in front of them is quite OK and also possible, since the usual idea is that all music has to be composed, then written down, and then performed.
The history of music in the past 50/60 years has been mostly about breaking that cycle, and showing that something new can be done, and nowhere is this more visible in electronic music with TD, Vangelis, Klaus Schulze, Riuychi Sakamoto and many others ... that pretty much have evolved and helped define the music themselves.
Seen them 4 times, I think ... Santa Monica Civic on the first tour in America, The Greek Theater the following year, when they set the trees on fire, and the pictures are on the "Live in America" album, and then during the "Tangram" period, and I do not remember where, and then again around 1987 or 1988 here in Portland, OR at the Arlene Schnitzler Hall.
All 4 times they were fantabulous. All you had to do was close your eyes and enjoy the music!