@ssun30 DCT’s also have lower transmissions losses, and are far better to get of the line quicker. Torque converters can take more torque but they also dissipate a lot more energy, specially moving from a standstill... Then, at least some of Toyota's torque converters, have gear lock up to reduced losses but still are some more.
@Faisal Sheikh BMW choose a cheaper ZF automatic gearbox for the Gxx M3, but from a performance perspective DCT’s still are a better performance gearbox, just look at every single superar/HyperCar. A straight cut sequential gearbox would be even better but it would be too aggressive and noisy for a road car.
In my opinion there isn’t a perfect auto gearbox, they go from more comfort oriented CVT up to full race car (sequential gearbox), with torque converters and DCT’s in the middle in this order.
Confort - Performance and feel
CVT-TC-DCT-ST
CVT’s could make a car faster, but completely soulless given it would keep the engine at maximum tilt everywhere...