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For one thing, the vidicon target voltage (and therefore sensitivity) had to be kept low to minimize dark current variations (shading). Plus, the lag was much worse with a high target voltage. Also, the relay optics were not very efficient, plus absorptive trimming filters were needed to get the color response right.
All the illustrations of usage I have seen are for surgery, microscope slides, or graphic charts, except for the "see yourself on color TV" exhibit at the Museum of Science and Industry in Chicago. The lighting for that consisted of a row of PAR bulbs that cast dark shadows in the subjects eye sockets and still were almost blinding. Even so, the lag was pretty awful. When someone stepped in front of the background mural, you could see the palm frond "through" them for several seconds. I don't think anyone used this camera for live studio work.
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