Dual clutch clutch packs cost something like two to three times as much as a regular clutch. And that's considering you can replace them. Early dual clutches claimed "lifetime" use... which meant that if you burned the clutch packs, you had to replace the entire transmission.
A dual clutch with a torque converter would be nice, but as you said... that extra-fast shift doesn't really matter all that much, in the grand scheme of things. I still like the Mazda torque converter automatic better than 99% of the dual clutches I've ever driven.
The Toyota-Lexus planetary gear system is better yet, but probably not applicable without hybrid assist.
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