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The way this term seam is used may be rooted in a reference to the manual transmission or the single clutch semi-automatic. From the driver's perspective, the DCT and this "LST" are seamless compared to a clutched manual shift, so marketing can run with it. Seamless is not an absolute term expressing a value of zero, nor is seam a value expressing no zero; they're both, in use, subjective terms. Yes, ideally, seamless should mean zero fluctation of torque applied to the wheel, however, as a wise Canadian once said, "The rules are all made up, and the points don't matter."