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I'm not disagreeing, but in a manual or DCT, the whole gear stack spins, they're just not locked to the output shaft. So, you're spinning 6 or 7 or 8 or 10 gears, and in the case of a DCT, you usually have four or more gear reductions in total, going through at least three shafts. With a Toyota HSD, it's what, a ring gear, three or four planetary gears, and one sun gear? Two reductions? I always assumed there would be fewer frictional and gear losses, and that the problem with the system was the need to oppose the ICE with an electric motor to get some of the drive ratios.
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