If CVT was superior, all the luxury and high performance vehicles would already be using it, not going to happen! CVT transmissions can't take the abuse, and rubber bands don't outlast gears!
Except for maybe a scooter or an ATV no car uses a rubber band in a CVT.
It is correct that Nissan had quality issues with theirs, but Subaru has been using CVTs since 2010 and Honda and Toyota are producing mass quantities of vehicles with CVTs. They are not expected to be any less reliable.
Enthusiasts, which prefer manuals anyway, don't like CVTs, though they have been getting better and normal people prefer the smoothness of the transmission when driving in parking lots or when going uphill.
Heavy duty CVTs exist in Nissan products and with Subaru products, including the WRX.
In theory, CVTs could potentially accelerate faster than a geared transmission, even a 9-speed. This is because peak engine torque can be maintained throughout the acceleration, whereas geared transmission is only momentarily at peak torque, is at 0 torque while shifting (when the car actually decelerates). CVTs do suffer from increased friction losses at high RPMs. More gears means more shifting which means more time when the car decelerates instead of accelerating. Also, at some point, with many gears, the difference in feeling to a CVT becomes minor.
In term of complexity, >6 gear transmission is extremely complex component, whereas a CVT is simple and cheaper.
Dual-clutch does shift very quickly, but is also heavier, larger and more expensive. It still is off peak torque most of the time when accelerating and still needs to shift. Robotic transmission does not shift as quickly, but perhaps feels closer to a manual.
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