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Early on, it was not so much product placement as the small Trinitrons producing a bright picture that could compete with studio lights.
Regarding the ultimate comparison of Trinitrons to later shadow mask tubes, the comparison was not THAT great. The shadow mask did originally block 85% of the electrons, the Trinitron grille less - but neither one can ever block less than 67% (2/3). Eventually many tubes reached 25% TRANSMISSION (75% blocking). Trinitrons also started out being poorer contrast in bright room lighting because of the higher percentage of the screen that was phosphor due to the continuous stripes. This was improved as more screen space was devoted to black matrix, and darker faceplate glass was used. The Trinitron had more capability to trade brightness for contrast, since it could be run with higher beam current before losing purity, and therefore darker glass could be used (but wasn't at first). The reason was that the aperture grille was under tension, so it would not move until it was so hot that it sagged.
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