CVTs still suffer from belt slippage at high tire speeds which is why manufacturers limit them for top speed runs. The 1.5T available here with a CVT can only do around 210 kph, the same car is available in the US with a manual and will easily hit 235 kph.
CVTs also cannot come close to handling the same amount of torque as a conventional torque-converter automatic. Most tuners hate them for this reason. About the only thing they are good for is fuel economy. And yes, the prosmatic is an old transmission, but it was never engineered for acceleration, rather it was only designed for economy. It has exceptionally long gear ratios, and slow slushy (comfort) shifting; meaning it has a loose torque converter. This is also why it wastes power. A properly tuned torque-converter automatic will always be quicker both at launch and at the top end than a CVT.
I'm also not sold on the reliability of CVTs compared with conventional autos, torque converters can take a lot of abuse, you can literally launch them like manual cars and they will still last more than 200,000 miles.