Greetings !!
See - DCT Gearbox is what a transition from old conventional Automatic gearbox for slow, steady response to those who seek Fun to drive and seamless gear shift
CVT Vs DCT - Real Work Drive Difference
As against regular CVT Automatic where there are infinite number of gear ratio and car when driven is best with
> Relaxed drive
> Light Foot on Accelerator
> For those who seek comfort
Its DCT which is what pitched towards buyers who seek
> Fun with seamless gear change response while going strong on throttle response
> Enjoy Superior Gear shift response as there are 2 clutch which are on the working - one for odd number gear and another for even number gear to bring a superior auto gear shift response
Hence, DCT are what generally offered in Turbo Petrol Engines
Shortcomings
Although IVT is very smooth but if car driver goes slight heavier on acceleration at sudden then
> RPM do not match in with the speed
> Increased Engine Noise
> Pickup takes a slight delayed response of 1 to 2 seconds
However, DCT Automatic cars are what designed to take away this disadvantage as otherwise seen in IVT and hence for those who seek superior pickup and fun is what offered in Turbo Petrol Engine, But for DCT Transmission one need to adjust in driving style
> Avoid driving with Half brake while commuting in bumper to bumper traffic
> As Creta do not come with Auto Hold Assist, so at Red Light stops for more than 30 Seconds. Important is to Slot Gear in Neutral at Idling. As practice avoid applying brakes while continue to slot gear in Drive Mode
> Some over enthusiast driver tend to abuse in DCT transmission system by driving with Full Acceleration in city roads and frequent brakes to enkoy fun of Turbo DCT - this should be avoided
If in case of any abuse in transmission - there could be probability of yes transmission overheating and may impact life on medium term
Recommendation
See if car to be used by your wife and she is a new learner, i presume she would be more interested to drive in comfort and relaxed way rather than with a heavier acceleration response.
IVT is very smooth, jerk free when driven in relaxed way and even end up offering in superior fuel efficiency when compared against DCT Automatic. Also, considering from reliability perspective - CVT is not as complex as DCT and what a far more conventional and internationally is considered a superior reliable technology at par with Torque converter and certainly as transmission system has superior reliability as against DCT one
Hope should help !!