CVT are delicate even today, go ahead and read pros and cons of CVT or try comparing conventional auto with CVT, you will find there are lot of consideration required for CVT transmission, while conventional auto is rigid and durable without too much consideration.
Foremost issue is the heatup issue on high load and continuous run, 2nd CVT car cannot be dragged to the road if broken, it can only be towed with front tires up, another thing is don't try to tow any other car with your CVT car, it can put extra pressure on transmission which will cause issues, another thing is CVT cannot be repaired, it can be replaced only which cost a lot more, it produces loud and uneven sound, not the smooth sound we used to hear in manual and conventional auto cars
There are however 2 benefit of CVT, it is fuel efficient and has smooth shifting (which is subjective because some people want to notice gear change when they push the car), let me know if i missed any other benefit of CVT.
Why manufacturers producing CVT ? because it is less costly to manufacture than conventional auto, you will not find CVT in any high end car, Check Lexus lineup, you will find 6 speed auto or 8 speed auto.
Another reason is that, In Western countries, repair cost is too much, so even repairing conventional auto cost much, due to which CVT has demand because if it is broken it can be replaced!